If you were passing 10 ml of cells from a growing flask to a new, sterile flask, the following are the steps you need to take: Assemble the required materials - sterile pipette, the old flask with cells, and a sterile flask with an appropriate culture medium.
Prepare the transfer flask by disinfecting it using a 70% ethanol solution to ensure that it is free of contaminants.Transfer the culture media to a sterile flask using the sterile pipette. You can do this by holding the pipette at an angle and pipetting the media down the side of the flask while rotating the flask. The angle of the pipette prevents the formation of air bubbles in the culture media.
The sterile pipette is used to extract the desired volume of the cell culture from the old flask and introduce it into the sterile flask. Avoid shaking the cells to ensure that they are not damaged. Discard the old flask containing the cells, then incubate the sterile flask with the cells at the appropriate temperature.
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QUESTION 1 Which of the following diseases is NOT caused by prions? a. Scrapie b. Mad cow disease c. Kuru d. Variant Creutzfeldt-Jakob Disease (VCJD) d. Poliomyelitis
The disease that is not caused by prions is Poliomyelitis.
Prions are infectious proteins that can cause disease in certain animals and humans. They are unique in that they do not contain nucleic acids, which are found in viruses, bacteria, fungi, and other microbes. Instead, they are misfolded versions of a normal protein called the prion protein.
When a prion comes into contact with a healthy prion protein, it induces the healthy protein to misfold and become a prion, resulting in a buildup of prions in the brain and other tissues.
The following are some of the diseases caused by prions:
ScrapieMad cow diseaseKuruVariant Creutzfeldt-Jakob Disease (VCJD)However, poliomyelitis is not caused by prions. Poliomyelitis, commonly known as polio, is caused by a virus. Poliovirus is highly contagious and spreads from person to person through contact with infected fecal matter or respiratory secretions. It attacks the nervous system and can lead to paralysis or even death. Polio can be prevented through vaccination.
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Can you build increased number of slow and fast twitch fibers,
or is this ratio of fibers in the body genetically determined?
Muscle fibers are categorized into two major types; fast twitch and slow twitch fibers. The number of slow and fast twitch fibers in the body is genetically determined. Physical training could not changte this ratio of fibers present in the body.
Training causes muscle fibers to grow in diameter and length, but the number of muscle fibers cannot be increased by training. In the same way, the ratio of fast twitch and slow twitch muscle fibers is determined by the individual's genetic makeup.The genetic make-up of a person can vary and plays a significant role in determining the ratio of muscle fibers present in the body.
It is possible to develop better endurance in people who have a lower percentage of slow-twitch fibers. However, people with a higher proportion of slow-twitch fibers are more likely to have better endurance capacity and higher oxygen uptake.The proportion of slow-twitch and fast-twitch fibers also influences the potential for developing muscle mass and the ability to gain strength.
People with a higher percentage of fast-twitch fibers can generally produce more power and have more potential for gaining muscle mass.The number of muscle fibers, as well as the ratio of fast and slow fibers, is genetically determined. However, the proportion of muscle fibers that is activated during training can be increased by improving the training program.
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The membrane principle of the cellular organization is the most ubiquitous concept essential to the cell. There is no cell without a membrane and no internal structure not associated with the membrane. The boundaries of cells are formed by biological membranes acting as barriers that prevent molecules generated inside the cell from leaking out and unwanted molecules from diffusing in; yet they also contain transport systems that allow specific molecules to be taken up and unwanted compounds to be removed from the cell. Such transport systems confer on membranes the important property of selective permeability. Membranes are dynamic structures in which proteins float in a sea of lipids. The lipid components of membrane form the permeabilitybarrier, and protein components act as a transport system of pumps and channels that endow the membrane with selective permeability. Learning Activity 4.1. Your group is now tasked to identify molecules making up the cell membrane that meets the descriptions or labels found in the table below. Furthermore, you should also be able to provide the role of each in the membrane. Do this activity in 30 minutes to be followed by class sharing and discussion.
The molecules making up the cell membrane are lipids (phospholipids, cholesterol) and proteins. Lipids form the permeability barrier, while proteins act as transport systems, pumps, and channels, providing selective permeability.
The cell membrane is composed of lipids and proteins. Phospholipids are the main lipid component of the membrane. They form a phospholipid bilayer, with hydrophilic heads facing outward and hydrophobic tails facing inward, creating a permeability barrier. This barrier prevents the free diffusion of hydrophilic molecules and ions across the membrane.
Cholesterol is another important lipid component of the membrane. It is interspersed within the phospholipid bilayer and helps regulate membrane fluidity and stability. Cholesterol maintains the proper balance between rigidity and flexibility of the membrane.
Proteins play crucial roles in the cell membrane. Integral membrane proteins are embedded within the lipid bilayer, while peripheral membrane proteins are loosely attached to the membrane's surface. These proteins act as transport systems, pumps, and channels that facilitate the selective permeability of the membrane.
Transport proteins, such as carrier proteins and channel proteins, facilitate the movement of ions and molecules across the membrane. Carrier proteins bind to specific molecules and undergo conformational changes to transport them across the membrane.
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Both the chemical energy consumed in foods and the metabolic energy expended by cells are measured in kilocalories (kcal) or Calories (C). The major source of food calories are carbohydrates, lipids, and proteins. For one gram, carbohydrates yield 4 kcal, fat 9 kcal, and protein 4 kcal. A well-balanced diet consists of about 33 percent carbohydrates, 33 percent fat, and 33 percent protein.
1. Estimate your basic energy needs or BMR- this is your basal metabolic rate; the number of calories you burn when your body is at rest.
1 Kilocalorie = 1000 calories
4 grams = 1 teaspoon
For every 2.2 lbs, you need about
1.3 Kilocalories every hour….take in too much, stored as fat
EX: (135/2.2) x 1.3 x 24 hours=1915 Kilocalories per day
2. Determine your activity factor value.
How active are you? Find the description in the following table that best matches your lifestyle. If you have a desk job but fit in a dose of daily exercise (at least 30 minutes), consider yourself in the light or moderate category.
Based on the information provided, your estimated daily energy needs would be approximately 1459.4028 kcal per day.
To estimate your basic energy needs or basal metabolic rate (BMR), you can use the following formula:
BMR = (Weight in kilograms / 2.2) x (1.3 kcal/hour) x 24 hours
Let's say your weight is 135 lbs (lbs stands for pounds), which is approximately 61.2 kilograms:
BMR = (61.2 / 2.2) x 1.3 x 24
= 28.72 x 1.3 x 24
= 941.856 kcal per day
So, your estimated BMR is approximately 941.856 kcal per day.
Now, to determine your activity factor value, you can refer to the table below:
Sedentary (little or no exercise)
Lightly active (light exercise or sports 1-3 days a week)
Moderately active (moderate exercise or sports 3-5 days a week)
Very active (hard exercise or sports 6-7 days a week)
Extra active (very hard exercise or sports, physical job, or training twice a day)
Based on your description of having a desk job but fitting in a dose of daily exercise (at least 30 minutes), you can consider yourself in the "light" or "moderate" category. For the sake of calculation, let's assume the "moderate" category.
Activity factor value = 1.55
Finally, you can calculate your daily energy needs by multiplying your BMR by the activity factor:
Daily energy needs = BMR x Activity factor value
= 941.856 kcal x 1.55
= 1459.4028 kcal
Keep in mind that this is just an estimate, and individual variations may apply. It's always a good idea to consult a healthcare professional or registered dietitian for personalized dietary advice.
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Question 1 Matching Instructions-Fill in the correct bubble for the BEST answer to each of the following: There is only one correct answer per question. Each question is worth 1.5 points. 7.5pts Primary Active Transport Secondary Active Transport [Choose] Has recognition, translocation, release, and recovery as a part of its mechanism of transport Uses an exergonic chemical reaction or light-energy to transport a substrate against a gradient Will not exhibit saturation kinetic behavior. Moves two or more substrates in the same direction across the membrane. Uses energy stored in an ion gradient to move a substrate against a gradient Carrier [Choose ] [Choose Channel [Choose Symport
Primary Active Transport - Uses an exergonic chemical reaction or light energy to transport a substrate against a gradient. Secondary Active Transport - Uses energy stored in an ion gradient to move a substrate against a gradient. Carrier - Has recognition, translocation, release, and recovery as a part of its mechanism of transport. Channel - Will not exhibit saturation kinetic behaviour. Symport - Moves two or more substrates in the same direction across the membrane.
Active Transport: Primary Active TransportThis type of active transport uses exergonic chemical reactions or light energy to transport a substrate against a gradient. This type of transport directly uses metabolic energy to transport the substrate. Primary active transport is also used to move ions out of cells to maintain resting potential. Secondary Active TransportIt is called secondary active transport since the transport proteins do not use metabolic energy directly. Instead, energy is derived from an ion concentration gradient created by primary active transport (P-type ATPase).
These transporters are called secondary transporters because they move solutes up a concentration gradient (uphill) but not against an electrochemical gradient. CarrierThe mechanism of transport for carrier proteins consists of recognition, translocation, release, and recovery. Carrier proteins are also known as transporters, carriers, or permeases. Carrier proteins move molecules across the cell membrane by changing conformation. The transport process in which the solute is transported is passive. ChannelThe transport proteins that function as channels are called channel proteins.
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Susan wants to reduce some of the wrinkles around her eyes. She goes to her dermatologist and she recommends Botox. SO many questions come up!! What is Botox? Isn't botulism a fatal disease? How can we use it for wrinkle reduction? Are the effects different? Is it safe? Are there any clinical uses for Botox? For this discussion, tackle some of Susan's questions above. make sure to give some science behind your responses!
Botox is a safe and effective treatment recommended by dermatologists for reducing wrinkles around the eyes.
Botox, short for botulinum toxin, is a purified form of the botulinum toxin produced by the bacterium Clostridium botulinum. While botulism is a serious and potentially fatal disease caused by this toxin, the medical use of Botox is completely different. Botox works by temporarily paralyzing or relaxing the muscles that cause wrinkles, thus reducing their appearance. It does not spread throughout the body or cause systemic effects when used in appropriate doses.
When injected into specific facial muscles, Botox blocks the release of acetylcholine, a neurotransmitter responsible for muscle contractions. By inhibiting muscle activity, Botox prevents the repetitive movements that contribute to the formation of wrinkles, particularly those caused by facial expressions like squinting or frowning. The procedure is minimally invasive and typically takes only a few minutes to complete.
Botox has been extensively studied and has a proven safety record when administered by trained professionals. It has been approved by regulatory authorities, such as the U.S. Food and Drug Administration (FDA), for cosmetic use in reducing wrinkles. Common side effects are mild and temporary, such as bruising or redness at the injection site, which usually resolve quickly.
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Which of these organs are present in insects but are not present in terrestrial isopods? O Crop O Hepatopancreas O Malpighian tubules Caeca
Insects have many more digestive, respiratory and excretory systems compared to Isopods (terrestrial or marine). Malpighian tubules are present in insects but are not present in terrestrial isopods (Option c).
Malpighian tubules are excretory structures found in insects that remove metabolic wastes from the hemolymph. The crop, the hepatopancreas and the caeca are present in both insects and terrestrial isopods. Crop stores the food after it is eaten, hepatopancreas aids in the digestion of the food and caeca helps in absorption of the nutrients from the food consumed. Hence, the correct answer is: Malpighian tubules.
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The wall of the glomerular capillary consists of two layers of smooth muscle cells. True False Question 29 2 pts Three physical forces are involved in glomerular filtration: glomerular capilary blood pressure, plasma-colloid osmotic pressure, and Bowman's capsule hydrostatic pressure. True False
False. The glomerular capillary wall has a single layer of endothelial cells that cover the capillary lumen. The cells are fenestrated, which means they contain pores that allow the passage of small solutes. Moreover, the glomerular capillary also has an underlying basement membrane, which functions as a selective barrier.
The glomerular filtration process is vital for the production of urine. The process occurs in the kidneys, where blood is filtered to remove excess fluids and waste products. The glomerular capillary is a crucial component of the process, and its structure plays a significant role in the filtration of blood.The capillary wall has a single layer of endothelial cells that cover the capillary lumen. The cells are fenestrated, which means they contain pores that allow the passage of small solutes.
The fenestrations are essential for the filtration of blood and prevent the passage of larger molecules such as proteins and red blood cells.The second force involved in glomerular filtration is plasma-colloid osmotic pressure. The force results from the presence of proteins in the blood, which create a pressure that pulls water back into the capillary.The third force is Bowman's capsule hydrostatic pressure. The pressure results from the pressure of fluid in Bowman's capsule, which pushes back against the glomerular capillary, reducing the rate of filtration.
In conclusion, the wall of the glomerular capillary does not consist of two layers of smooth muscle cells but a single layer of endothelial cells. Glomerular filtration occurs through three physical forces: glomerular capillary blood pressure, plasma-colloid osmotic pressure, and Bowman's capsule hydrostatic pressure. The three forces are vital in the filtration of blood and production of urine.
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The thermal death point of bacteria is described as a. The lowest temperature at which a population of a target organism is killed in 10 minutes b. The highest temperature at which a population of a target organism is killed in 10 minutes
c. The shortest time required to kill a suspension of cells or spores under defined conditions at a given temp d. The lowest temp required to kill a suspension of cells or spores under defined conditions at a pH e. The point where bacteria no longer grow
The thermal death point of bacteria is defined as the lowest temperature at which a population of a target organism is killed in 10 minutes. The thermal death point is one of the important parameters used to measure the heat resistance of a bacterial population. It is of great significance in the food industry since it indicates the heat treatment required to kill a particular bacterial species.
The thermal death point of a bacterial species can vary significantly and is influenced by factors such as pH, moisture content, and the presence of salts and organic compounds. The thermal death point is determined by heating a suspension of bacterial cells at a constant temperature for a specified time, followed by measuring the viability of the cells using viable count or turbidity methods.Some bacteria may require higher temperatures or longer exposure times to achieve the same degree of thermal inactivation as others.
The thermal death point is usually determined for a specific bacterial species under defined conditions. Therefore, it is essential to determine the thermal death point of a particular organism under the conditions of interest.The thermal death point of bacteria is not related to the point where bacteria no longer grow.
It is a measure of the temperature required to kill a bacterial population and not the minimum temperature required for growth.
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Cancer symbolizes the? top ten causes of death in america. worst fears of our age. disease for passive-type people. status of a fatal disease.
Cancer symbolizes the top ten causes of death in America and represents the status of a fatal disease.
Cancer is a multifaceted disease that affects millions of people worldwide and is one of the leading causes of death in America. It symbolizes the harsh reality of mortality and the fragility of life. The prevalence and impact of cancer have made it a significant concern in society, evoking fear and anxiety among individuals. It represents the status of a fatal disease because it poses a significant threat to a person's health and well-being. Cancer can be aggressive and unpredictable, challenging the resilience of both patients and their loved ones. It symbolizes the urgent need for medical advancements, improved treatments, and greater awareness to combat its devastating effects. The battle against cancer requires a proactive and comprehensive approach, involving medical professionals, researchers, policymakers, and the community at large.
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Usually in cells, atp is hydrolyzed into adp, or ____________ , releasing a ____________ molecule and energy.
In cells, ATP is typically hydrolyzed into ADP, or adenosine diphosphate, releasing a phosphate molecule and energy.
ATP (adenosine triphosphate) is the primary energy currency in cells. It stores and releases energy during various cellular processes. When ATP is hydrolyzed, it undergoes a reaction where a water molecule is used to break the bond between the second and third phosphate groups. This hydrolysis reaction results in the formation of ADP (adenosine diphosphate) and an inorganic phosphate molecule (Pi). The released phosphate molecule can be used in other metabolic reactions or to phosphorylate other molecules, while the energy released during this process is used to drive cellular activities.
The hydrolysis of ATP into ADP and Pi is an exergonic reaction, meaning it releases energy. This energy is utilized by the cell to perform various functions such as muscle contraction, active transport of ions across cell membranes, synthesis of macromolecules, and other energy-requiring processes. The energy released from ATP hydrolysis is harnessed by coupling it with endergonic reactions that require energy. This coupling allows the transfer of energy from ATP to the target molecules, enabling them to perform their specific cellular tasks. Overall, the hydrolysis of ATP into ADP and Pi is a crucial process for cellular energy metabolism and maintaining the energy balance within the cell.
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Match the following: 1. Cancer 2. Plague 3. Smallpox 4. COVID-19
5. Influenza ✓ [Choose ] 1. SARS-CoV2 2. H1N1 3. Yersinia pestis 4. CLL 5. Variola major 6. Mycobacterium 7. Tuberculosis
The matching of the given terms are as follows:1. Cancer: 4. CLL, 2. Plague: 3.Yersinia pestis, 3. Smallpox: 5.Variola major, 4. COVID-19: 1.SARS-CoV-2, 5. Influenza: 2.H1N1.
1. Cancer: Chronic Lymphocytic Leukemia (CLL) CLL is one of the most common types of leukemia that occurs when bone marrow makes too many lymphocytes, a type of white blood cell. The exact cause of this cancer is unknown, and there is no cure for CLL.
2. Plague: Yersinia pestis. Yersinia pestis is the bacterium that causes the plague, which is a severe bacterial infection that is typically spread through flea bites. There are three types of plague: bubonic plague, septicemic plague, and pneumonic plague.3. Smallpox: Variola major : Smallpox is an infectious disease that is caused by the Variola virus. This virus causes fever, body aches, and a rash that usually starts on the face and spreads to the rest of the body.
4. COVID-19: SARS-CoV-2 : SARS-CoV-2 is the virus that causes COVID-19, which is a highly infectious respiratory illness. COVID-19 emerged in Wuhan, China, in December 2019, and it has since spread rapidly across the globe.5. Influenza: H1N1 : Influenza, also known as the flu, is a viral infection that attacks the respiratory system. H1N1 is a type of influenza A virus that causes a pandemic in 2009.
It is a contagious virus that can spread from person to person. Thus, the matching of given terms are as follows:
1. Cancer: CLL2. Plague: Yersinia pestis3. Smallpox: Variola major4. COVID-19: SARS-CoV-25. Influenza: H1N1.
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Which are true regarding respiration and the respiratory system? Polycythemia vera is a possible negative consequence of prolonged exposure to hypoxia. The alveoli are categorized as a protective epithelium. Oxygen is the primary drive for ventilation. The primary means of matching ventilation and perfusion is reflex control. The ventral respiratory group controls sternocleidomastoids, abdominals, and internal intercostals.
The true statements regarding respiration and the respiratory system include is Polycythemia vera is a possible negative consequence of prolonged exposure to hypoxia.
Respiration is the process by which oxygen is taken up and used in the body to generate energy, while the respiratory system is made up of structures that allow for gas exchange in the body.
- Polycythemia vera is a possible negative consequence of prolonged exposure to hypoxia: This is true. Polycythemia vera is a blood disorder in which the body produces too many red blood cells, causing blood to thicken and reducing blood flow. Prolonged exposure to hypoxia, or low oxygen levels, can lead to polycythemia vera as the body tries to compensate by producing more red blood cells.
- The alveoli are categorized as a protective epithelium: This is false. The alveoli are small air sacs in the lungs that are responsible for gas exchange. They are lined with a thin layer of cells called the alveolar epithelium, which is not a protective epithelium.
- Oxygen is the primary drive for ventilation: This is false. Carbon dioxide is the primary drive for ventilation, as it regulates the body's respiratory rate and ensures that enough carbon dioxide is exhaled to maintain a healthy pH balance in the blood.
- The primary means of matching ventilation and perfusion is reflex control: This is false. The primary means of matching ventilation and perfusion, or the flow of air and blood through the lungs, is through the regulation of blood flow to different parts of the lungs. This is known as pulmonary circulation and is not controlled by reflexes.
- The ventral respiratory group controls sternocleidomastoids, abdominals, and internal intercostals: This is false. The ventral respiratory group is a group of neurons in the medulla oblongata that controls the basic rhythm of breathing. It does not control specific muscles like the sternocleidomastoids, abdominals, and internal intercostals, which are controlled by other respiratory centers in the brainstem.
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After finishing your summerebrown neuroscience course, you make great leaps and bounds in the field of neuroscience and become a forensic neuropathologis You work closely with the medical examiner in cases in which the cause of death is questioned. You have just been asked to examine the brain tissue (post-mortem) for the case of an elderly woman who recently died. Which of the following features would best and most concluslve indicator that the woman had Alaheimer's disease at the time of death? inereased volume of erey matter Presence of beta-amyloid plagues in hippocareos Enlarged bateral ventricles Decreased volume of white matter Lniarged hippocamput
The feature that would best and most conclusive indicator that the woman had Alzheimer's disease at the time of death is the "Presence of beta-amyloid plaques in the hippocampus."Alzheimer's disease is a chronic neurodegenerative disease that generally starts slowly and gets worse over time.
It is the cause of 60–70% of cases of dementia. The disease is characterized by the progressive death of brain cells, initially in the hippocampus and then in other areas of the brain, leading to cognitive decline and behavioral changes. The most reliable diagnostic marker of Alzheimer's disease is the presence of beta-amyloid plaques and neurofibrillary tangles in the brain's tissue. Alzheimer's disease diagnosis is often made based on post-mortem brain tissue examination where the presence of amyloid plaques, neurofibrillary tangles, and other signs of neuronal loss and synaptic dysfunction are analyzed. Therefore, the feature that would best and most conclusive indicator that the woman had Alzheimer's disease at the time of death is the "Presence of beta-amyloid plaques in the hippocampus."Ans: Presence of beta-amyloid plaques in the hippocampus.
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Explain what is required for a cell to be able to respond to a hormone. what would we call such a cell?
A cell needs two main components to be able to respond to a hormone. First, the cell must have specific receptors on its surface or within its cytoplasm that can recognize and bind to the hormone.
These receptors are typically proteins. Second, the cell must have signaling pathways or mechanisms that are activated upon hormone binding, leading to a cellular response. These pathways can involve various intracellular signaling molecules and enzymes.
A cell that is able to respond to a hormone is often referred to as a target cell or a hormone-responsive cell.
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A patient comes to the emergency room because she is unable to feel anything touch the right side of her body. Case Example 2 A patient visits his doctor, because he is having increasing difficulty in controlling his emotions and sensations of hunger. He often feels afraid during the day, although there is nothing dangerous or scary happening, and he is sometimes feeling very aggressive for no apparent reason Case Example 3 A patient has a stroke (bleeding in an area of the brain) - after the stroke, she is unable to see things that are toward the left of her body, even though her eyes both seem to be working fine.
When a patient is unable to feel anything touch the right side of her body, it may be a case of somatosensory disorder or hemineglect. Somatosensory disorders are usually a result of damage to the somatosensory cortex or pathways. This damage can be caused by traumatic brain injury, stroke, or degenerative disorders.
The inability to feel is usually accompanied by an inability to move, leading to paralysis. In the case of the patient having difficulty in controlling his emotions and sensations of hunger, it is possible that he is suffering from damage to the hypothalamus. The hypothalamus is responsible for regulating hunger and thirst, as well as emotional regulation. Damage to this region can lead to erratic behavior, emotional instability, and excessive hunger.
The patient with stroke who is unable to see things that are toward the left of her body, although her eyes both seem to be working fine may be suffering from hemianopia. Hemianopia is usually a result of damage to the visual cortex or pathways. Damage to the right hemisphere of the brain can cause the left-sided blindness described.
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Consider the following intermediate chemical equations . ch 4 (g)+2o 2 (g) co 2 (g)+2h 2 o(g)2h 2 o(g) 2h 2 o(l) which overall chemical equation is obtained by combining these intermediate equations ? ch 4 (g)+2o 2 (g) co 2 (g)+2h 2 o(l); ch 4 (g)+2o 2 (g) co 2 (g)+2h 2 o(g) o o ch 4 (g)+2o 2 (g) co 2 (g)+4h 2 o(g)+2h 2 o(l); ch 4 (g)+2o 2 (g) co 2 (g)+6h 2 o(g).
The overall chemical equation obtained by combining the given intermediate equations is: CH4(g) + 2O2(g) → CO2(g) + 2H2O(l).To obtain the overall chemical equation, you need to combine the intermediate equations by canceling out the common species.
In this case, the intermediate equations have water (H2O) as a common species.
In the first intermediate equation, 2H2O(g) is formed as a product. In the second intermediate equation, 2H2O(g) is also formed.
To combine these equations, you add the two equations together, canceling out the common species:
CH4(g) + 2O2(g) + 2H2O(g) + 2H2O(g) → CO2(g) + 2H2O(l)
Simplifying the equation, you get:
CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)
Therefore, the overall chemical equation obtained by combining these intermediate equations is:
CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)
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The use of glucose by the cell is called_____and produces____,_____ and______Glycolysis does or does notrequire oxygen and is an aerobic or anaerobicprocess? The final product of glycolysis is______ molecules of pyruvic acid and____ molecules of ATP. Glycolysis uses_____ molecules of ATP for the chemical reaction so the net gain of ATP is____ 2 molecules. This is efficient or inefficientuse of glucose. Pyruvic acid converts to________ and leads to__________ After all steps of cellular respiration,____ molecules of ATP are produced -____ molecules from glycolyis and ___aerobic metabolism. Energy is lost in the production of_________
The use of glucose by the cell is called cellular respiration, and it produces energy, carbon dioxide, and water. Glycolysis is the initial step of cellular respiration and can occur both in the presence (aerobic) or absence (anaerobic) of oxygen.
The use of glucose by the cell is called Glycolysis and produces energy, carbon dioxide, and water.
The final product of glycolysis is two molecules of pyruvic acid and two molecules of ATP.
Glycolysis uses two molecules of ATP for the chemical reaction so the net gain of ATP is 2 molecules.
This is efficient or inefficient use of glucose. Pyruvic acid converts to lactic acid and leads to lactic acid fermentation.
After all steps of cellular respiration,38 molecules of ATP are produced -
2 molecules from glycolysis and 36 aerobic metabolism. Energy is lost in the production of ATP.
Overall, cellular respiration, including glycolysis and aerobic metabolism, allows the cell to efficiently extract energy from glucose molecules. However, due to the energy loss and the relatively low ATP yield from glycolysis, the process of glucose utilization can be considered somewhat inefficient.
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A patient in an emergency room complained to the doctor that she was not able to feel heat on her hand. The doctor knew that there were two nerve cells between the heat receptors in the hand and the heat-sensitive receptors in the brain. The arrangement of these receptors is shown in the following diagram. The doctor thought that the trouble might be in the synapse between A and B and made the following two hypotheses: A) No neurotransmitter is being released from nerve cell A. B) Nerve cell B does not have receptors for the neurotransmitter that is released from A. To test these hypotheses, the doctor designed an experiment to apply a neurotransmitter to the cell body of nerve cell A and observe any activity from nerve cell B. Evaluate whether or not this experiment would enable the doctor to support one hypothesis and reject the other. During World War I, physicians noted a phenomenon called "phantom pains'. Soldiers with amputated limbs complained of pain or itching in the missing limb. Using your knowledge of the nervous system explain why you think this phenomenon exists
In order to test these hypotheses, the doctor designed an experiment to apply a neurotransmitter to the cell body of nerve cell A and observe any activity from nerve cell B.
If the application of the neurotransmitter to the cell body of nerve cell A leads to nerve cell B getting active, this would imply that there are receptors for the neurotransmitter on nerve cell B. This would support hypothesis B and reject hypothesis A.However, if the application of the neurotransmitter to the cell body of nerve cell A does not lead to nerve cell B getting active, this would imply that there are no receptors for the neurotransmitter on nerve cell B. This would support hypothesis A and reject hypothesis B.A phenomenon called "phantom pains" occurs when a patient complains of pain or itching in a missing limb after amputation.
Phantom limb pain may be related to the brain's neuroplasticity, which refers to its ability to reorganize itself by forming new neural connections throughout life. When the sensory nerves in an amputated limb are severed, the area of the brain that previously received input from those nerves loses that input, and new connections may form between that area of the brain and the surrounding nerves that are still intact. When these new connections form, the brain may misinterpret the signals from the intact nerves as signals coming from the amputated limb, resulting in phantom limb pain.
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The larger the coefficient of selection, the faster allele frequencies will change via natural selection.
True/False
The larger the coefficient of selection, the faster allele frequencies will change via natural selection. The statement is True.
The coefficient of selection (s) represents the strength of selection acting on a particular allele. It indicates the reduction in relative fitness of individuals carrying that allele compared to individuals without the allele. When the coefficient of selection is larger, it indicates stronger selection against the allele.
In natural selection, alleles that confer higher fitness are more likely to increase in frequency over time, while alleles with lower fitness are more likely to decrease in frequency or be eliminated from the population. The larger the coefficient of selection, the greater the difference in fitness between individuals with the allele and those without it, leading to a stronger selective pressure.
Therefore, a larger coefficient of selection accelerates the rate at which allele frequencies change through natural selection, making it more likely for the allele to either increase or decrease in frequency in the population over generations.
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_____ is used to measure the electrical activity produced by a muscle or muscle group.
Electromyography (EMG) is used to measure the electrical activity produced by a muscle or muscle group. It involves placing electrodes on the skin overlying the muscle of interest. These electrodes detect the electrical signals generated by the muscle fibers when they contract or relax.
To perform an Electromyography (EMG), the muscle is usually first relaxed to establish a baseline. Then, the muscle is contracted either voluntarily or by applying an electrical stimulus. The electrical activity produced by the muscle is then recorded and displayed as a graph or waveform.
EMG is a valuable tool in various fields, including sports medicine, rehabilitation, and neurology. It can help diagnose and monitor conditions such as muscle disorders, nerve damage, and neuromuscular diseases. By analyzing the electrical activity patterns, healthcare professionals can assess the functioning of muscles and the communication between muscles and nerves.
In summary, electromyography (EMG) is used to measure the electrical activity produced by a muscle or muscle group. It involves placing electrodes on the skin over the muscle of interest and recording the electrical signals generated during muscle contractions or relaxations. EMG is a useful diagnostic tool in several medical fields.
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The country of aqua has an economy that is based entirely on lobsters. when it produces and sells ________ lobsters in a given day, income earned will ________.
When the country of Aqua produces and sells more lobsters in a given day, its income earned will increase.
In the context of an economy based entirely on lobsters, the income earned by the country of Aqua will be directly influenced by the quantity of lobsters it produces and sells. When the country produces and sells a greater number of lobsters in a given day, its income will increase. This is because the revenue generated from selling each lobster contributes to the overall income of the country. By increasing production and sales, the country can generate more income from the lobster market and potentially experience economic growth.
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Case report forms should be developed to be able to translate the trial activities into data. a.True b. False
This statement is a True statement. Here's an explanation of the same:What is a Case Report Form?A case report form CRF is a document used to collect data for a clinical trial.
It is an essential element of clinical trials. The main objective of the CRF is to collect data from the trial subjects and to transform it into an analyzable form. It contains all the data that the investigator or sponsor needs to collect from the trial subjects. The CRF design varies depending on the trial's needs and complexity. Each CRF includes several fields that must be completed for each subject.
CRFs can be electronic or paper-based. An electronic CRF allows the study team to enter data directly into a web-based application, whereas paper-based CRFs must be filled out by hand.The Bottom Line:Case report forms should be developed to be able to translate the trial activities into data. Therefore, the given statement is True. The CRF is an essential document for clinical trials, as it assists in collecting data from the trial subjects and transforming it into an analyzable form. It contains all the data that the investigator or sponsor needs to collect from the trial subjects.
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1) In your own words, please explain the difference between the scientific definition of "theory" and the folk use of the word "theory".
2) In your own words, please explain Darwin’s theory of Natural Selection.
3) In your own words, please explain how the process of meiosis leads to siblings that are not clones of each other.
4) In your own words, please explain why anthropologists study primates.
5) In your own words, please explain the term balanced polymorphism and how it relates to the interaction of genes, culture, and environment. (i.e. Sickle-cell anemia, Tay-sachs)
6) In your own words, please explain how the Hardy-Weinberg equilibrium allows you to measure the rate of change.
7) In your own words, please explain Gregor Mendel’s law of segregation.
Meiosis results in genetic variation because of three main processes: crossing over, independent assortment, and random fertilization.
These processes allow for genetic recombination, so that siblings are not clones of each other.4. Why anthropologists study primates:Anthropologists study primates because they are the closest living relatives of humans and provide insights into human evolution, behavior, and culture. They also help anthropologists understand the origins of human social behavior and language. By studying primates, anthropologists can learn about the physical and social characteristics that have evolved in primates over millions of years.
5. Balanced polymorphism and how it relates to the interaction of genes, culture, and environment:Balanced polymorphism refers to the situation where two or more alleles for a trait are maintained in a population because each allele provides a selective advantage under different environmental conditions. It relates to the interaction of genes, culture, and environment because cultural practices, such as consanguineous marriage, can lead to the maintenance of certain alleles in a population. In addition, environmental factors, such as malaria prevalence, can contribute to the maintenance of alleles that confer resistance to the disease.
6. How the Hardy-Weinberg equilibrium allows you to measure the rate of change:The Hardy-Weinberg equilibrium is a principle that states that in a large, randomly mating population, the frequencies of alleles and genotypes will remain constant from generation to generation.
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4. Consider the following fermentation data for Selenomonas ruminantium products formed per millimole of glucose: Product Amount formed (nmol) Lactate 0.31 Acetate 0.70 Propionate 0.36 succinate 0.61 Source: Michel, T. A., and J. M. Macy. 1990. Generation of a membrane potential by sodium- dependent succinate efflux in Selenomonas ruminantium. J. Bacteriol. 172:1430–1435. Find the fermentation balance according to both the O/R method and the available hydrogen method. What percentage of the glucose carbon is recovered in end products?.
The fermentation balance of Selenomonas ruminantium can be determined using the available hydrogen method. The percentage of glucose carbon recovered in end products is calculated to assess the efficiency of fermentation.
The fermentation balance of Selenomonas ruminantium can be determined using the O/R method and the available hydrogen method. According to the provided fermentation data, the amounts of various products formed per millimole of glucose are as follows: lactate (0.31 nmol), acetate (0.70 nmol), propionate (0.36 nmol), and succinate (0.61 nmol).
By applying the O/R method, the fermentation balance can be calculated by considering the oxidation-reduction reactions involved in the process. This method takes into account the amount of oxygen consumed during fermentation. However, since the given data does not include information about oxygen consumption, the O/R method cannot be directly applied.
On the other hand, the available hydrogen method considers the stoichiometry of the fermentation process. It calculates the fermentation balance based on the principle that all reducing equivalents generated from glucose must be accounted for in the end products. In this case, the products formed include lactate, acetate, propionate, and succinate. By summing up the amounts of these products (0.31 + 0.70 + 0.36 + 0.61 = 1.98 nmol), we find that a total of 1.98 nmol of products is formed per millimole of glucose.
To determine the percentage of glucose carbon recovered in the end products, we need to consider the molecular weights of the products and glucose. Glucose has a molecular weight of 180 g/mol, and the molecular weights of the products can be determined from their chemical formulas. By dividing the total carbon content of the products (1.98 nmol) by the total carbon content of glucose (1 mmol or 180 nmol), we can calculate the percentage of glucose carbon recovered.
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3. Beta-hemolytic Streptococci are classified as ________.
Group C Streptococci
Group D Streptococci
Group A Streptococci
Group B Streptococci
4. Necrotiizing fasciaiitis (a skin disease) is also known as flesh-eating disease and is the result of infection with streptococcus pyogenes. S. pyogenes is classified as a Group A strep. Which form of hemolytic activity does S. pyogenes carry out?
Alpha hemolysis
Hemolysis is not considered a virulence factor of S. pyogenes
Gamma hemolysis
Beta hemolysis
5. Puncturing the agar after streaking introduces ________ conditions, which can make interpretation of hemolytic activity easier.
only aerobic
both anaerobic and aerobic
only anaerobic
Beta-hemolytic Streptococci are classified as Group A Streptococci.
Beta-hemolytic Streptococci are classified as Group A Streptococci. Streptococcal bacteria are classified based on their hemolytic activity, which is characterized by the breakdown of red blood cells.
Group A, B, C, D, and G Streptococci are the five classifications of hemolytic Streptococci.
4. S. pyogenes carry out Beta hemolysis form of hemolytic activity. S. pyogenes is classified as a Group A strep, which is one of the Beta-hemolytic Streptococci.
Hemolysins (proteins) produced by S. pyogenes can lyse erythrocytes and other cell types, producing a clear zone of beta-hemolysis around the colonies.
5. Puncturing the agar after streaking introduces both anaerobic and aerobic conditions, which can make interpretation of hemolytic activity easier.
To determine hemolysis, a blood agar plate is used. Hemolysis on blood agar plates can be hard to read in some situations. Puncturing the agar after streaking exposes it to oxygen and allows for better visualization of hemolysis.
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QUESTION2 Match the following. A. Contraction strength increases the first few muscle twitches due to an Tetanus increase in muscle temperature or calcium availability in the muscle. Treppe B. Contractions become stronger due to more muscle fibers being activated Maximal stimulus due to an increase in the intensity of stimulation. Wave summation C. Contractions become stronger due to an increase in frequency of Multiple motor unit summation of recrulment. stimulation and less time for relaxation (lengthening) of the muscle. D. Continued,sustained smooth contraction due to rapid stimulation and no relaxation of the muscle. E. The stimulus above no stonger contraction can be elicted because all motor units are firing in the muscle.
A. Treppe: Increase in muscle strength with each subsequent contraction due to increased muscle temperature or calcium availability.
B. Multiple motor unit summation: Stronger contractions achieved by activating more muscle fibers through increased stimulation intensity.
C. Wave summation: Stronger contractions due to increased stimulation frequency and reduced relaxation time of the muscle.
D. Tetanus: Continuous, sustained smooth contraction resulting from rapid stimulation and no muscle relaxation.
E. Maximal stimulus: Point at which all motor units in the muscle are firing, no further increase in contraction strength can be achieved.
A. Treppe (also known as the staircase effect) refers to the phenomenon where the strength of muscle contractions increases with each subsequent twitch when the muscle is stimulated immediately after a period of rest. This increase in contraction strength is typically attributed to an increase in muscle temperature or calcium availability.
B. Multiple motor unit summation (also known as recruitment) occurs when stronger contractions are achieved by activating more muscle fibers through an increase in the intensity of the stimulation. This recruitment of additional motor units allows for a greater force generation in the muscle.
C. Wave summation (also known as temporal summation) describes the phenomenon where contractions become stronger due to an increase in the frequency of stimulation. With shorter intervals between successive stimuli, the muscle has less time to relax (lengthen) fully, resulting in a cumulative increase in muscle contraction force.
D. Tetanus refers to a sustained and continuous smooth contraction of a muscle that occurs when the muscle is stimulated at a high frequency, preventing relaxation between contractions. This sustained contraction is achieved when the muscle is unable to relax due to rapid stimulation.
E. The maximal stimulus refers to the point at which all motor units in a muscle are firing, and further increases in stimulus intensity no longer result in a stronger contraction. At this point, the muscle has reached its maximum force-generating capacity, and any additional stimulation does not produce a further increase in contraction strength.
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Draw and/or describe the various inputs to the respiratory
centers in humans
The respiratory center is responsible for controlling the breathing mechanism in humans. It is situated in the brain stem, especially the medulla oblongata. The respiratory center generates the necessary motor output for inhalation and exhalation. It obtains its inputs from various organs, such as the lungs, blood, and nervous system. The inputs of the respiratory center are divided into two categories: chemical and neural.
The chemical inputs are blood pH, carbon dioxide (CO2) level, and oxygen (O2) level. These inputs can affect the breathing pattern of a person. For example, an increased CO2 level will stimulate the respiratory center to increase the respiratory rate and depth to eliminate excess CO2. The neural inputs are divided into two parts: central and peripheral. The central inputs come from the brain, such as the cerebral cortex, limbic system, and hypothalamus. These regions can influence the respiratory pattern by their activities. The peripheral inputs come from the lungs, airways, and other organs.
They provide information about the lung stretch, temperature, and irritants. In conclusion, the respiratory center receives various inputs from chemical and neural sources to regulate the breathing mechanism of humans. These inputs can affect the respiratory pattern and maintain the homeostasis of the body. The respiratory center continuously monitors these inputs and generates the necessary motor output to maintain the respiratory rate and depth.
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How do you change the magnification of a microscope _____ a. move the objective lenses b. move the ocular lens c. move the condenser d. move the focus knobs
The magnification of a microscope can be changed by moving the objective lenses. The objective lenses are the lenses closest to the object being observed and can be rotated to change the magnification.
There are typically several objective lenses of varying magnifications on a microscope, and they are often color-coded to indicate their magnification power. To change the magnification, you can simply rotate the objective lens turret to switch to a different objective lens with a higher or lower magnification power.The ocular lens, on the other hand, is the lens closest to the eye and is used to view the image created by the objective lens. It does not change the magnification of the microscope.
Similarly, the condenser lens is used to focus the light onto the object being observed and does not affect the magnification. The focus knobs, on the other hand, are used to adjust the focus of the microscope by moving the stage up or down. They do not change the magnification of the microscope.
Therefore, the correct answer to this question is a. move the objective lenses.
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40
(W) The amount of air breathed in and out during regular resiration is refcred to as (4) R Residual Volume (3) B FEVIIFVC (3) c vital Capacty (31) 0 Tidal Volume
The correct option related to the amount of air breathed in and out during regular respiration is "Tidal Volume." Tidal Volume refers to the volume of air that is inhaled and exhaled during a normal breath. It represents the amount of air involved in typical breathing without any additional effort or deep inhalation or exhalation.
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