BMI is the body mass index that uses mass and height to measure the fitness of the body. BMI is not accurate for athletes, and pregnant women except for children.
What is BMI?BMI has been abbreviated for body mass index and is based on the measure of height and weight to derive the category an individual lies in like underweight, normal, obese, overweight, etc.
BMI is not an accurate way to predict health as it does not calculate the body fat percentage and distribution. It is not an accurate measure for adults older than 65 years, pregnant women, and athletes. On the other hand, it can be used for children as they have a less fat percentage.
Therefore,BMI is the body mass index that uses mass and height to measure the fitness of the body. BMI is not accurate for athletes, and pregnant women except for children.
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the stimulation of auditory nerves depends on the opening and closing of channels in the auditory hair cells. which type of gating mechanism do these cells use?
The cells use a stress-gated gating mechanism as the stimulation of auditory nerves depends on the opening and closing of channels in the auditory hair cells.
The auditory nerve fibers carry the frequency and strength of the sound stimulus to the brain from the internal hair cells. Cochlear tonotopic in mammals is connected to frequency coding. However, phase blocking at the level of hair cells provides the basis for the coding of sounds with a frequency lower than 3 kHz.
There are cation channels that are mechanically gated in the membrane of stereocilia. The tallest neighboring stereocilium's tip is connected to these cation channels by proteins called tip link proteins. These cation channels open as a result of the basilar membrane's vibration, allowing cations—most notably K+—to enter the cytosol of hair cells. The receptor potential depolarizes when cations enter. Thus, the cells use a stress-gated gating mechanism as the stimulation of auditory nerves depends on the opening and closing of channels in the auditory hair cells.
The complete question is:
The stimulation of auditory nerves depends on the opening and closing of channels in the auditory hair cells. Which type of gating mechanism do these cells use?
(a) voltage-gated
(b) extracellular ligand-gated
(c) intracellular ligand-gated
(d) stress-gated
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What effect does hCG have on the body?.
During pregnancy, the placenta secretes a hormone called human chorionic gonadotropin (hCG). It signals the body to cease menstruating and thickens the uterine lining to assist a developing embryo.
After fertilization, HCG levels increase and stay elevated for around 10 weeks of pregnancy.The hormone known as hCG is in charge of the majority of early pregnancy symptoms. certain symptoms and indications that cause women to wonder if they could be pregnant. These symptoms—breast tenderness, mild emotionality, nausea, and fatigue—are all brought on by high hCG levels.
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Abraham maslow studied the lives of people such as abraham lincoln in order to understand the nature of.
Abraham maslow studied the lives of people such as abraham lincoln in order to understand the nature of self-actualization.
How do you explain self-actualization ?Depending on who you ask, self-actualization might mean many different things.Abraham Maslow, a humanistic psychologist, provided one of the definitions that is most commonly used. Being "all you are capable of being" is how he defined self-actualization.The same concept is described by San Diego therapist Kim Egel as the "capacity to become the best version of oneself."Self-Actualization examples. (1943 Maslow). Extrapolating from this phrase, we may witness self-actualization in situations like: A painter who produces work even though he has never made a profit from it continues to do so because it gives him satisfaction and makes him happy.As human beings, we have fundamental psychological requirements for lifelong personal development.
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define what mutations and mutagens are, differentiating among the different types of point mutations and their different effects.
A mutagen is a substance that causes DNA alterations (mutations); these substances can harm DNA physically or chemically. An modification to one nucleotide in a chromosomal DNA molecule is known as a point mutation. A base substitution mutation occurs when one base pair in DNA is switched out for another.
A mutagen is an agent, such as radiation or a chemical substance, which causes genetic mutation. A mutation is defined as a permanent alteration of the nucleotide sequence of the genome of an organism, virus, extrachromosomal DNA, or other genetic components.
The primary Difference between a mutation and a mutagen is that while a mutation is an agent that results in a change in the genetic sequence of an organism, a mutagen is the change that occurs naturally. In addition, different factors, such as chemical, physical, or biological agents that can act as mutagens, can be used to categorize mutations.
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which category of autoantibodies destroys the platelets in a child with primary thrombocytopenic purpura?
IgG category of autoantibodies destroys the platelets in a child with primary thrombocytopenic purpura.
A reduction in the quantity of platelets in the blood is a characteristic of the blood condition known as immune thrombocytopenic purpura (ITP). Blood cells called platelets aid in the cessation of bleeding. Easy bruising, bleeding gums, and internal bleeding are all symptoms of platelet deficiency.
Easy bruising, bleeding, and tiny reddish-purple dots on the lower thighs are possible symptoms.
When it affects children, ITP typically goes away on its own. Adults frequently require medical care for bleeding. Rarely, it could be necessary to remove the spleen.
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the fossil of tiktaalik, which exhibits fins, scales and gills along with a flat head and wristlike forelimb is much like a fish as well as a tetrapod. this type of fossil is an example of a fossil, which supports the idea that animals descended from a common ancestor.
The fossil of tiktaalik is a Traditional fossil.
The idea it supports:The fossil of Tiktaalik resembles both a fish and a tetrapod because it has fins, scales, and gills as well as a flat head and a forelimb that looks like a wrist. Traditional fossils like this one are an illustration that animals shared an ancestor, according to this form of fossil. its significances that is a fish that obfuscates the line between a fish and an animal that lives on land. letting us know that this fish can live in shallow water and even make brief forays ashore and supports the idea that animals descended from a common ancestor.
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Compared with DNA replication, transcription is _______ error prone because of differences in _______.
A) more; excision repair
B) more; the number of copies made
C) less; the proofreading system
D) less; the number of copies made
E) more; the proofreading system
Compared with the DNA replication, transcription is more error prone because of differences in the proofreading system. Thus, the correct option is E.
What is Transcription?Transcription is the process which occurs in the nucleus of the cell. During this process, the synthesis of mRNA (messenger RNA) from DNA takes place. This mRNA then leads to the formation of protein.
The most common type of error in transcription is a (C to U) base substitution and transitions that occur more frequently than transversion events, as found in case of spontaneous mutation. Therefore RNA polymerase base mis-incorporations appear to resemble DNA polymerase base mis-incorporations.
Therefore, the correct option is E.
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in some instances, the levels of ldl cholesterol exceed the ability of the body to maintain homeostasis, and as a result, the excess material accumulates into fatty deposits that harden into plaques. arrange in the correct order the sequence of events that leads to this condition, known as atherosclerosis: the plaques harden, blocking the flow of blood in major arteries. white blood cells become engorged with fatty deposits. excess ldl cholesterol accumulates in the interior of arterial walls. macrophages are drawn to this site. view available hint(s)for part a in some instances, the levels of ldl cholesterol exceed the ability of the body to maintain homeostasis, and as a result, the excess material accumulates into fatty deposits that harden into plaques. arrange in the correct order the sequence of events that leads to this condition, known as atherosclerosis: the plaques harden, blocking the flow of blood in major arteries. white blood cells become engorged with fatty deposits. excess ldl cholesterol accumulates in the interior of arterial walls. macrophages are drawn to this site. 3-1-2-4 3-2-4-1 1-3-4-2 3-4-2-1
The correct order of the sequence of events leading to the condition of atherosclerosis is as follows:
Excess LDL cholesterol accumulates in the interior of arterial walls.Macrophages are drawn to this site.White blood cells become engorged with fatty deposits.The plaques harden, blocking the flow of blood in major arteries.Correct answer: Numerous 3, 4, 2, 1.
This is because through these four processes in sequence, they lead to atherosclerosis.
Explanation of the processes leading to atherosclerosisExcess LDL cholesterol accumulates inside the arterial walls: This is the initial stage of atherosclerosis, where LDL cholesterol accumulation occurs in the arterial walls.Macrophages are attracted to this site of LDL cholesterol accumulation and begin to engulf the LDL particles.White blood cells fill with fatty deposits as they break down the LDL particles.As fatty deposits accumulate, they form plaques that harden and block blood flow in the main arteries, leading to atherosclerosis.Learn more about the atherosclerosis:
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Please help me with this!
Phototropism occurs when a plant bends or grows in a specific direction in reaction to light. Shoots tend to migrate toward the light, while roots tend to grow away from it.
What is phototropism in plants?Phototropism, or the differential cell elongation of a plant organ in response to directed blue light, allows the plant to optimize photosynthetic light uptake in the aerial section as well as water and nutrient acquisition in the roots.Phototropism is classified into two types: positive and negative. Growth toward a light source is referred to as positive phototropism, while growth away from a light source is referred to as negative phototropism. Because plant roots need to extend deeper into the ground for plant stability, water, and nutrients, they display negative phototropism.To learn more about Phototropism refer,
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Two fruit flies that are heterozygous for body color and eye color are crossed. Brown body color is dominant to black body color. Red eye color is dominant to brown eye color. Use the punnett square to determine the ratio of offspring with the described trait to the total number of offspring:.
Answer:
Black because people collar balack
using the images for help, place in the correct order of occurrence from left to right the events that occur at the neuromuscular junction after the action potential reaches the axon terminal.
Synaptic vesicles carrying neurotransmitters are present (stored) in the axon terminal prior to the action potential arriving there.
What is a neuromuscular junction?The correct order of occurrence from left to right.
The axon terminal is entered by Ca²⁺.
ACh is released by synaptic vesicles.
ACh receptors are bound by ACh.
Opening of ligand-gated cation channels.
K⁺ leaves and Na⁺ enters.
The less negative potential exists in membranes.
Therefore, the membrane of the axon terminal is depolarized as the action potential reaches the neuromuscular junction, which triggers the release of acetylcholine into the synaptic cleft in response to calcium influx.
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all of the following are true regarding nk cells except all of the following are true regarding nk cells except they destroy infected body cells by phagocytosis. they are found in tissues of the lymphatic system. they have the ability to kill infected body cells and some tumor cells. they are a type of lymphocyte. they release toxic substances that cause cell lysis or apoptosis.
All of the given options are true regarding NK cells except- they destroy infected body cells by phagocytosis.
NK cells- It is the primary function of NK (natural killer) cells, which make up 10%–15% of peripheral blood mononuclear cells and have the shape of big, granular lymphocytes, to kill virus-infected and malignantly altered cells without pre-exposure. NK cells take involvement in a variety of immunological responses in vivo, as well as the regulation of hematopoiesis and reproductive processes.
The first line of protection against many viruses is provided by natural killer cells. They are able to identify and kill infected host cells because they can tell them apart from uninfected host cells. By doing this, they can get rid of the infection or at least keep it under control until virus-specific T cells and antibodies can be made.
Therefore, all the given options about NK cells are correct except- they destroy infected body cells by phagocytosis.
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g which are the most numerous and diverse vertebrates? multiple choice reptiles bony fishes mammals cartilaginous fishes lancelets
Bony fish have the most and most varied vertebrae.
Which vertebrates are the most numerous and varied?The biggest and most diversified group of vertebrates is the teleost fishes.
Prokaryotes are by far the most numerous group of life on Earth. They are also by far the most diversified in terms of phylogeny and metabolism; they include both the Bacteria and the Archaea, two of the three main categories of living things.
Insects are the most varied category of creatures, meaning that there are more species of them than any other group, it has long been acknowledged and documented. There are an estimated 900,000 distinct species of live insects in the globe.
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a 38 year old overweight female is afmittes for evaluation of nonstemi her bmi is 28 and she has a afamily history of cacrdiovascular disease
The BMI is a helpful indicator of obesity and overweight. Based on your weight and height, it is determined. The BMI is a reliable indicator of your risk for illnesses that might develop as a result of having a higher body fat percentage. Your chance of developing certain conditions including heart disease, high blood pressure, type 2 diabetes, gallstones, respiratory issues, and some malignancies increases with your BMI.
The majority of men and women can utilize BMI, although there are several restrictions: It could overstate body fat in those with strong builds, such as athletes. In older people and other people who have lost muscle mass, it might underestimate body fat.
Weight BMI
Underweight Below 18.5
Normal 18.5–24.9
Overweight 25.0–29.9
Obesity 30.0 and Above
Since the women's BMI is 28, she is overweight. She is prone to cardiovascular diseases.
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What happens during unprotected sex?.
Answer:
There are a lot of things that happen.
Explanation:
There can be:
1. Unwanted pregnancy
2. Contacting STIs
A circular plasmid has two restriction sites for the enzyme Zsp2I, which cleaves the site ATGCA↓T (the arrow indicates the position of the cleavage). After digestion the fragments are ligated together, and a circular product is isolated that includes one copy of each of the fragments. Does this mean that the ligated plasmid is the same as the original? Explain.
The circular product is not having the same plasmids as before but the plasmids have same restriction sites that's why they able to ligate.
Circular plasmids: What are they?Plasmids are small, circular, extra-chromosomal DNA molecules found in a wide range of microorganisms, most notably bacteria, that can replicate independently of their hosts.
Whether or not the bacterial host is replicating its own DNA, plasmids can be copied numerous times, and each time a plasmid vector is copied, the introduced DNA it contains is as well. They are rounded. Circular DNA is ideal for incorporating additional DNA sequences.
Although occasionally linear or RNA-based plasmids exist, plasmids are typically circular DNA molecules. They can be single or multiple copies, and they can contain anywhere between a few dozen and several hundred genes.
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choose all the functions of the enteric nervous system. multiple select question. to regulate the secretion of digestive enzymes to regulate the respiratory rate to regulate the formation of gametes to regulate motility through the digestive tract to regulate salivation
To regulate motility through the digestive tract to regulate salivation
What is enteric nervous system and its parts?The enteric nervous system, the rather autonomous component of the nervous system, is formed from several neural circuits that regulate motor and local blood flow as well as immunological and endocrine activity as well as motor and local blood flow.
The myenteric (Auerbach) and submucosal (Meissner) plexuses are the main parts of the ENS. The myenteric plexus controls the relaxation and contraction of the intestinal wall and is situated between the longitudinal and circular smooth muscle layers. The ENS, commonly referred to as "the second brain" or "the gut brain," may autonomously regulate intestinal absorption and digestion.
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a cancerous tumor located on an exposed area that does not distort the face or its features should be
The mastoid process is located behind and below the auditory canal, lateral to the styloid process, and has the form of a conical or pyramidal projection. It forms a bony prominence behind and below the ear.
Submandibular area. A recurved margin having a greater projection than the adjacent area physiognomically describes a. Bend. A fissure in the skin accompanied by bordering elevations physiognomically described. A furrow or furrow. Most sunken eyes can be treated with synthetic fillers or, even better, with your body's own fat cells. Lower eyelid surgery (lower blepharoplasty) may also be needed if the problem is a deep tear pit with a protruding lower eyelid fat pad. Trochanter. This landmark is present only in the femur and refers to a very large, blunt, and irregularly shaped process of the femur that serves as an attachment point for muscles and ligaments. On the femur there is a greater trochanter and a less prominent lesser trochanter.
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Select all of the following reasons why the rooting powder stimulated root growth.
1 The powder sent chemical signals to initiate cell division.
2 It sent chemical signals promoting cells to differentiate.
3 It provided extra nutrition to the branches during growth.
4 It sent chemical signals telling cells to shrink.
5 The powder provided extra water to cells.
Hormone rooting powders and gels use synthetic auxins to simulate plant growth and promote root formation. Therefore, option (1) and (2) are correct.
Why does rooting powder stimulate root growth?Rooting hormone, often known as rooting powder, is a chemical that can be applied to plant cuttings in order to stimulate the growth of roots and improve the chances of successfully propagating the plant.
Every single plant possesses hormones, one of which is called auxin, also known as the growth hormone. Auxin is created in the immature regions of the plant, which is where growth is required. In order to simulate the effects of natural growing circumstances on plants and to stimulate the development of roots, hormone rooting powders and gels make use of synthetic auxins.
Therefore, rooting powder send signals to promote cell division and differentiation.
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The picture below shows you several organs working together, including your lungs, bronchi and windpipe (trachea). This means this picture shows you a __?
system
The image below shows several organs working together, including the lungs, bronchi, and windpipe (trachea). This picture shows the pulmonary system
What is pulmonary system?The upper and lower pulmonary structures, bronchial/systemic circulation, and gas exchange at the level of the lungs and tissue cells make up the pulmonary system. The delivery of oxygen and the elimination of carbon dioxide are the two fundamental objectives that these anatomical components jointly pursue. The nose and pharynx are examples of the higher structures. The pharynx is made up of the laryngopharynx, oropharynx, and nasal cavity. These structures function to filter, humidify, warm, and balance ear pressure in the ambient air. The larynx, trachea, carina, bronchi, bronchioles, and alveoli are among the lower structures. These structures' main function is to transport oxygen to and carbon dioxide away from the alveoli, where gas exchange occurs. Except for the region around the mediastinal space, the whole thoracic cavity is occupied by the lungs. The mediastinal area is home to the heart, major blood veins, bronchi, and esophagus, among other organs. The ventilation and diffusion processes are the two fundamental jobs of the lungs.
• Ventilation: the movement of air between the alveoli and the atmosphere.
• Diffusion: the movement of oxygen and carbon dioxide from a higher concentration to a lower concentration across the respiratory membrane.
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t/f: a dna mutation that affects the primary structure of the alpha-globin protein subunit would also affect the primary structure of the beta-globin protein subunit. (T/F)
(F)alse
False. A DNA mutation that affects the primary structure of the alpha-globin protein subunit would not affect the primary structure of the beta-globin protein subunit.
A mutation is a change in an organism's DNA sequence. Mutations can occur as a result of errors in DNA replication during cell division, mutagen exposure, or viral infection.
Genetic mutations are changes to your DNA sequence that occur during cell division, which occurs when your cells replicate themselves. Your DNA code instructs your body on how to form and function. Genetic mutations may cause genetic diseases such as cancer, or they may help humans better adapt to their environment over time.
The HBB gene codes for the production of a protein known as beta-globin. The HBA1 gene codes for the production of a protein known as alpha-globin.
Alpha-globin is a subunit (component) of hemoglobin, the protein found in red blood cells that transports oxygen to cells and tissues throughout the body. Beta-globin is a component (subunit) of hemoglobin, a larger protein found inside red blood cells. In adults, hemoglobin normally consists of four protein subunits: two beta-globin subunits and two alpha-globin subunits produced by another gene called HBA.
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gram-negative enteric bacteria, such as salmonella and e. coli, are designated by the following antigens: for the flagellar antigen; for the capsular antigen; and for the cell wall antigen.
H stands for the flagellar antigen, K for the capsular antigen, and O for the antigen found on cell walls.
Which two E coli pathotypes are specifically linked to diarrhea in children?The thermostable toxin and the thermolabile toxin, which are encoded by plasmids, are the two enterotoxins that distinguish ETEC strains. Among all E. coli pathotypes, this pathogen is the most frequent cause of diarrhea in children and the main factor in developing country travelers' diarrhea.
Which of the following is a typical salmonella host?Raw meat, poultry, and seafood are frequently contaminated foods. During the butchering process, feces may contact raw meat and poultry. If it was harvested from contaminated water, seafood might be contaminated.
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Thrombocytopenia can result when there is disruption in the production of which component of blood?.
Answer: Thrombocytopenia results in disruption in the production of Platelets
Explanation:
Different issues with your platelets include: Thrombocytopenia is the term for decreased platelet counts in the blood. You may be at risk for minor to major bleeding as a result of this. Your immune system may unintentionally target and destroy your platelets as a result of autoimmune illnesses such as immune thrombocytopenia (ITP), lupus, and rheumatoid arthritis. Your bone marrow can be harmed by cancers like leukaemia or lymphoma, which can kill blood stem cells. Your blood clots with the aid of platelets, stopping the bleeding. It's not a major issue for most folks. However, if you have a severe form, you may spontaneously bleed in your eyes, gums, or bladder or bleed excessively when hurt.
What are 5 examples of genetic factors?.
Most of child's physical characteristics, such as height, weight, body structure, eye color, hair texture, and even intelligence and aptitudes, are influenced by genes.
The pattern of inheritance of certain health problems caused by a combination of genetic and environmental factors is referred to as multifactorial inheritance. Certain risk genes contain variants that do not cause disease but increase the likelihood of symptoms.
Understanding genetic factors and genetic disorders is essential for learning more about health promotion and disease prevention. Some genetic changes have been linked to an increased risk of having a child with a birth defect or developmental disability, as well as developing diseases like cancer or heart disease.
Genes serve as the blueprint for our bodies. A change in a gene disrupts the gene message. Changes in genes can result in a variety of conditions. A changed gene can be inherited, which means it is passed down from parent to child.
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the disease you investigated involved a problem in the nervous system. explain how other body systems were affected by this error.
If the condition under investigation caused issues with the neurological system, ALS, or amyotrophic lateral sclerosis, may have an impact on other bodily parts.
All of the body's muscles atrophy as a result of the slow death of motor neurons caused by ALS disease. The essential breathing muscles may become paralyzed as a result of ALS. Carbon dioxide builds up in the body and oxygen cannot be exchanged if the respiratory muscles deteriorate. The muscular system is one of ALS's main targets. An ALS patient's muscles become so weak that they are unable to function. Walking, speaking, eating, and maintaining posture become challenging as a result.
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a student has two flasks of growing algae. to one flask he adds some phosphorus, while he leaves the other flask alone. he monitors population numbers of the algae daily for three weeks. at the end of this time both populations are stable, but the phosphorus-containing flask has 10 times more algae. which statement is true?
A student has two flasks of growing algae. to one flask he adds some phosphorus, while he leaves the other flask alone. At the end of the day both populations are stable, but the phosphorus-containing flask has 10 times more algae as the phosphorus increased the carrying capacity of the environment.
Too much phosphorus can promote the growth of algae and large aquatic plants, resulting in lower levels of dissolved oxygen- a process known as eutrophication. High phosphorus levels can also cause algae blooms, which can produce algal toxins that are harmful to human and animal health.
Phosphorus (P) is a necessary element for plant and animal growth, as well as for profitable crop and livestock production. It can also boost surface water biological productivity by hastening eutrophication, the natural aging of lakes and streams caused by nutrient enrichment.
Phosphorus, like nitrogen, is an essential nutrient for all life. Phosphate (PO4) is the most common form of phosphorus used by biological organisms, and it is important in the formation of DNA, cellular energy, and cell membranes (and plant cell walls). Commercial fertilizers frequently contain phosphorus.
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At the start of a 100-yard dash (race), your body relies on which reserve as its energy source?.
The human body reserves creatinine phosphate as the energy source at the start of 100 yard dash (race).
The creatinine phosphate is converted into ATP, which is the energy package of our body. ATP is body's usable form of energy. Energy is stored in various forms in our body such as fats, carbohydrates and proteins. At a microscopic level, it is stored in molecules like creatinine phosphate. Carbohydrate and fats are the primary source of our body followed by proteins.
Our body uses three different forms of metabolism to convert these molecules in ATPs. These three processes are Phosphagen System, Aerobic Respiration and Glycolic/Anaerobic respiration.
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why did the investigators keep the identities of each virus generation a secret from the other researchers developing the phylogenetic tree?
Correct answer option (B) To be sure that only the sequence information was used in the construction of the phylogenetic tree.
A phylogenetic tree is a diagram that represents the evolutionary relationships between organisms.A family tree is a hypothesis, not a definitive fact. Family tree divergence patterns reflect how a species or other group evolved from a set of common ancestors.
A phylogenetic tree is a visual representation of the relationships between different organisms, showing the evolutionary process from a common ancestor to various descendants. Trees can represent relationships ranging from the entire history of life on Earth to individuals within a population.
Phylogenetic analysis provides a deep understanding of how species evolve through genetic change. Phylogeny allows scientists to assess the pathways linking current organisms to their ancestral origins and to predict genetic divergences that may occur in the future.
Complete question:
Why did the investigators keep the identities of each virus generation a secret from the other researchers developing the phylogenetic tree?
A) To preserve the privacy of information coming out of private research labs
B) To be sure that only the sequence information was used in the construction of the phylogenetic tree
C) To create the most challenging set of conditions that would ever be encountered in a phylogenetic analysis
D) To reduce the chances for error by the second set of researchers as they interpreted the sequence information
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Which of the following phenomena is not an evolutionary mechanism? A. Gene flowB. Natural selectionC. MutationD. Genetic driftE. Random mating
Random mating is a phenomenon that is not an evolutionary mechanism
Evolution is a term that describes how an organism evolved from another form that is different from its current form.Of the options given, random mating is not an evolutionary mechanism.
Take people for example. Humans were thought to have evolved into humans (through several evolutionary steps) from Australopithecus.
There are several mechanisms that contribute to evolution. Mutation, non-random mating, gene flow, finite population size (genetic drift), natural selection, etc.
Mutations are the original cause of all genetic variation, but mutation rates in most organisms are rather low. Therefore, the impact of novel mutations on allele frequencies from one generation to the next is usually not large.
Non-random mating. In non-random mating, organisms may prefer to mate with other organisms of the same genotype or different genotypes.
Gene flow involves the transfer of genes to and from populations by either individual organisms or their gametes (egg and sperm, e.g. by pollen dispersal through plants).
Population size is not infinite (genetic drift). Genetic drift includes changes in allele frequencies due to random events. This is literally a "sampling error" when selecting next-generation alleles. Drift can occur in populations of any non-infinite size, but affects small populations. natural choice. Finally the most famous evolutionary mechanism! Natural selection occurs when alleles (or combinations of alleles from different genes) make an organism more or less compatible, that is, allow it to survive and reproduce in a particular environment.
Therefore, random mating is not an evolutionary mechanism.
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The process by which homologous chromosomes can exchange genetic information during prophase i of meiosis is known as_____?.
The exchange of genetic material between homologous chromosomes is known as recombination. The chromosomes condense and become apparent inside the nucleus during prophase I.
DNA fragments are broken and recombined during the recombination process to create novel allele combinations. The genetic variety that results from this recombination process at the gene level reflects variations in the DNA sequences of various species.
Recombination normally takes place during meiosis in eukaryotic cells, which are cells containing a nucleus and organelles. Gametes, or egg and sperm cells, are created during the cell division process known as meiosis. The homologous pairs of paternal and maternal chromosomes align during the first stage of meiosis. Chromosome arms may touch during the alignment and momentarily merge, leading to a crossover. Recombination and the transfer of genetic material between the maternal and paternal chromosomes occur as a result of crossovers.
Hence,
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