In E. coli, the lac operon is under both negative and positive transcriptional control by the repressor protein and the catabolite activator protein (CAP).
The lac operon encodes proteins that transport and degrade lactose within the cell. In the absence of glucose, CAP allows bacteria to use alternative carbon sources such as lactose. In the absence of lactose, the lac repressor ensures that the lac operon is turned off.
Glucose and lactose levels regulate the initiation of lac operon transcription via their effects on the lac repressor protein and CAP.
Lactose increases the concentration of allolactose, which binds to and removes the repressor protein from the DNA.
The addition of glucose reduces the concentration of cyclic AMP. Because cyclic AMP does not bind to CAP, this gene activator protein dissociates from the DNA, effectively shutting down the operon.
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After trees pull water in through their roots, the water must move up to their leaves for photosynthesis to occur. Since the water molecules cling to each other and to the inner surface of the plant's vascular tissues, the water pulls itself up through the tree by capillary action. Which property of water molecules allows them to cling together?
Answer:
Water has an amazing ability to adhere (stick) to itself and to other substances. The property of cohesion describes the ability of water molecules to be attracted to other water molecules, which allows water to be a "sticky" liquid
Which of the following statements about the conditions shown in the u-shaped tube are true?
a. There is less free water in the right arm of the tube than in the left arm of the tube.
b. Water is tightly clustered around the hydrophilic solute molecules on both sides of the membrane.
The following statements about the conditions shown in the u-shaped tube are true:
a. There is less free water in the right arm of the tube than in the left arm of the tube.
b. Water is tightly clustered around the hydrophilic solute molecules on both sides of the membrane.
In the u-shaped tube image, the first statement which is true about the u-shaped tube indicates that the left arm has more solute than the right arm. Although, the diagram mentioned indicates equal volumes on both the sides. So, concentration will depend on the amount of solute that dissolves in the solvent.
Here's the complete question with picture of u-shaped tube attached:
Which of the following statements about the conditions shown in the u-shaped tube are true?
a. There is less free water in the right arm of the tube than in the left arm of the tube.
b. Water is tightly clustered around the hydrophilic solute molecules on both sides of the membrane.
c. Solutes can pass through the selectively permeable membrane from right to left, but free water cannot.
d. There is more solute in the left arm of the tube than in the right arm of the tube.
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1.
Which type of seismic wave is the fastest moving?
surface waves
S waves
focus waves
P waves
Answer:P waves
Explanation:
P waves travel fastest and are the first to arrive from the earthquake. In S or shear waves, rock oscillates perpendicular to the direction of wave propagation. In rock, S waves generally travel about 60% the speed of P waves, and the S wave always arrives after the P wave.
what would happen if one of your organs no longer work
Answer: The body would gradually lose its ability to maintain homeostasis when one system shut down, and the other systems would follow suit.3.The muscular, nervous, and skeletal systems would be the primary ones working together.
Explanation:
Some chemical reactions in cells take place inside vesicles.
a. TRUE
b. FALSE
The statement some chemical reactions in cells take place inside vesicles is TRUE (Option A).
What is a cellular vesicle?A cellular vesicle is a membranous cellular structure that contains chemical substances (e.g. neurotransmitters) produced by the cell, which may remain inside the cell or fuse to the plasma membrane to release the content to the external media.
Therefore, with this information, we can conclude that a cellular vesicle may contain chemical messengers or enzymes such as lysosomes that react inside the vesicle or fuse the plasma membrane to release the content outside the cell.
Complete question:
Choose the correct option. Some chemical reactions in cells take place inside vesicles.
a. TRUE
b. FALSE
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In goats, a recessive gene causes the goats to "faint" when they are startled. A farmer breeds two goats (that
have never fainted) and their first offspring faints two days after its birth. What must the parent's genotypes
have been? Show the cross to prove it.
Answer:
In goats, a recessive gene causes the goats to "faint" when they are startled. A farmer breeds two goats (that have never fainted) and their first offspring faints two days after its birth.
Explanation:
Dehydration is the most common cause of fainting in children. Not drinking enough fluids also reduces blood volume and lowers blood pressure. Standing still for a long time in one place. This can cause the blood to pool in the legs because of gravity or standing up quickly.Because the "tester" individual makes one known type of gamete, the ratios of phenotypes among the progeny of the cross indicate the type and frequencies of gametes made by the individual with the unknown genotype. Once you know the gametes that this individual produces, you can "reconstruct" the individual's genotype.
which screening is used for lung disease
Which organisms are classified as gymnosperms? Select all that apply. giant sequoia bristlecone pine bald cypress cherry tree
The organisms that are classified as gymnosperms are as follows:
Bristlecone Pinegiant sequoia bald cypress What is a gymnosperm?Gymnosperms are plants such as a conifer whose seeds are not enclosed in an ovary.
Gymnosperms are the second group of plants after angiosperms or flowering plants. They are characterized by their inability to produce flowers or fruits, hence, bear their seeds in cones.
The largest group of living gymnosperms are as follows:
Conifers made up of pines, cypresses, and relatives
Cycads
Gnetophytes e.g. Gnetum, Ephedra and Welwitschia Ginkgo biloba (a single living species)
Therefore, bristlecone Pine, giant sequoia and bald cypress are the gymnosperms in the list given in the options.
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Nutrients encourage the growth of blue-green algae. The process of nutrient enrichment in a waterway is called.
Answer:
eutrophication
Usually found outside the capsule, ________ protect the articular cartilages and act as packing material for the joint.
Usually found outside the capsule, fat pads protect the articular cartilage and act as packing material for the joint.
Subcutaneous fat cells are clustered together to form fat pads. They might be discovered elsewhere in the body in addition to the face.
These fat pads act as cushions to absorb shock.
What are Articular cartilages?
The smooth, white tissue that lines the ends of bones where they meet to form joints is called articular cartilage. It is easier to move when our joints have healthy cartilage. It makes it possible for the bones to move relatively freely past one another. An injury or ordinary wear and tear can harm articular cartilage.
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Can anyone help please ;-;
Answer:
1 for Human Emissions
2 for Air-Sea Gas exchange
3 for Microbial Respiration and Decomposition
(where 1 is the greatest emission and 3 is the least emission)
Explanation:
Human Emissions consists of burning fossil fuels and producing greenhouse gasses. Cars, Coal burning factories, and such all make the human emission of carbon dioxide the greatest emission factor.
Air-sea exchange is a natural process where the ocean and the atmosphere exchange common molecules including carbon dioxide in order to balance out gases (gas-concentrations).
Microbial Respiration and Decomposition is another natural event that happens when living things breathe, decompose, etc.
Because the earth is covered with 71% of water and only about 29% land, the air-sea exchange far outnumbers microbial resp. & decomp. So, air-sea is 2 (2nd greatest factor) and microbial is 3 (least factor).
excess salt in humans in excreted in both______and______
Excess salt in humans in excreted in both Urine and sweat .
When you get more sodium than you need, the kidneys flush out the excess by making more, or saltier, urine. If they can't get rid of enough sodium, though, it accumulates in the fluid between cells. Drinking too much water isn't the only thing that can make you have to pee nonstop.
A diet high in sodium can sensitize cells in the brain that are part of the sympathetic nervous system, which controls the body's so called fight or flight response. Salt makes your body hold onto water. If you eat too much, the extra water in your blood means there is extra pressure on your blood vessel walls, raising your blood pressure.
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how are internal and external respiration alike? group of answer choices both involve carbon dioxide diffusing into the body's tissues. both involve carbon dioxide diffusing into the lungs. both involve oxygen diffusing into the lungs. both involve oxygen diffusing into the body's tissues. both involve an exchange of gases.
Both internal respiration and external respiration involves an exchange of gases.
Internal Respiration- It typically refers to the gas exchange that takes place between both the blood and cells, primarily between oxygen and carbon dioxide. In alveolar tissues during internal breathing, oxygen attaches to the hemoglobin and is delivered to other body tissues.
External Respiration- In the process of external respiration, oxygen diffuses into to the bloodstream and carbon dioxide into the alveolar air in the lungs. In the involved in the metabolism tissues, internal respiration takes place as oxygen diffuses from the blood and the carbon dioxide diffuses from the cells.
The given question format is incorrect, find below the correction question format,
Q. How are internal and external respiration alike?
A. Both involve an exchange of gases.
B. Both involve carbon dioxide diffusing into the lungs.
C. Both involve oxygen diffusing into the lungs.
D. Both involve carbon dioxide diffusing into the body's tissues.
E. Both involve oxygen diffusing into the body's tissues.
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in the experiment the uptake of oxygen during aerobic respiration why did the oil drop move towards the container?
Living things utilize oxygen for aerobic respiration by absorbing it from the environment. In the respirometer experiment, the oil drop moves toward the container as the organisms breathe in oxygen.
What is aerobic respiration?
In the presence of oxygen, cells undergo cellular respiration, which is how energy from food is produced. Most plants, animals, birds, humans, and other mammals regularly engage in this sort of respiration. As byproducts of this process, water and carbon dioxide are created.
With a respirometer, it is possible to examine how changing the temperature affects the breathing rate. To gauge the rate of breathing, respirometers are utilized. The oil drop indicates the movement of the liquid inside the tube. It moves to the deficit side, showing the requirement for oxygen.
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50 POINTS!!! ASAP
Which best describes a cell process common to both prokaryotic and eukaryotic
cells?
Both cell types carry out transcription in the nucleus.
Both cell types use ribosomes to translate mRNA into proteins.
Both cell types package proteins in the golgi apparatus.
Both cell types carry out translation in the endoplasmic reticulum.
Answer:
NO 3 :Both cell types use ribosomes to translate mRNA into proteins.
Answer: option 3
Explanation:
1. What is the difference between a population, a community, and an ecosystem?
2. What is the difference between a niche and a habitat?
3. Why are the roles in different ecosystems the same but the species that fill them often different?
4. Why is a food web a better representation of the feeding relationships of organisms than a food chain?
5. Why does a predator kill its prey but a parasite rarely kills its host?
6. How can carbon cycle very quickly from the atmosphere and then back into the atmosphere?
7. Describe one way that carbon can be stored for a short time in the natural cycle.
8. Describe two ways that carbon can be stored for a very long time in the natural cycle.
9. Describe two ways that humans interfere with the natural carbon cycle.
10. Describe two important functions for carbon dioxide in the atmosphere.
Answer:
population is number of people in a city state etc
community is what the people are like in a town
ecosystem is like jungle rainforest grasslands etc...
Explanation:
In pyruvate oxidation, a three-carbon pyruvate molecule is converted to a two-carbon acetyl group. What happened to the other carbon molecule?.
The other carbon molecule accepts two oxygen atoms and is released as carbondioxide.
What is pyruvate oxidation?Pyruvate is a yellowish organic keto acid, 2-oxopropanoic acid, which occurs as an intermediate in many metabolic processes, especially glycolysis.
During glycolysis, simple sugar glucose is degraded to yield pyruvic acid, and ATP as an energy source. The pyruvate enters the mitochondrion of the cell and proceeds in the Krebs cycle.
In the krebs cycle, two molecules of pyruvate are converted into two molecules of acetyl CoA. Two carbons are released as carbon dioxide.
3-carbon pyruvate molecule made in glycolysis loses a carbon to produce a new, 2-carbon molecule called acetyl CoA. The carbon that is removed takes two oxygens from pyruvate with it, and exits the body as carbon dioxide.
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help---->
(A1) Which phase of mitosis would you think that Taxol would affect the most?
(B2) Why do you think it affects that phase the most?
(C3) What are some possible problems that a person taking Taxol might have?
(D4) What would be happening to the normal cells trying to perform mitosis if a person is taking Taxol?
1. The phase of mitosis that Taxol would affect the most is M Phase.
2. It affects the M phase the most because Taxol inhibits cell replication by disrupting normal mitotic spindle formation and arresting cell growth in the M phase of the cell cycle is found to inhibit cell proliferation and thus block mitosis.
3. Some possible problems a person taking Taxol might have are Nausea, vomiting, diarrhoea, mouth sores, muscle/joint pain, numbness/tingling/burning of the hands/feet, flushing, dizziness, or drowsiness.
4. The concentration of taxol that suppressed dynamics in interphase cells was found to inhibit cell proliferation and block mitosis by preventing progression from metaphase to anaphase.
Taxol is an anti-mitotic agent that binds to microtubules and stabilizes them against depolymerization; therefore, Taxol inhibits cell replication by disrupting normal mitotic spindle formation and arresting cell growth in the M phase of the cell cycle.
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Write a newspaper column explaining the process of meiosis to an ordinary reader
with little knowledge of biology. (need help TT)
The term 'meiosis' is generally used in biology to describe a special type of cell division. This process is responsible for the formation of sex cells or gametes, i.e. sperms and eggs, during sexual reproduction.
During meiosis, a single cell undergoes the process of cell division twice to give rise to four cells. These newly formed cells possess only half of the genetic information as compared to the original parent cell. This genetic information is more specifically related to the number of chromosomes in the cell.
Since the number of chromosomes is halved in the four gamete cells that are produced by meiosis, they are called haploid.
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71) the most likely cause for the shift in caterpillar peak mass is a) pesticide use. b) earlier migration returns of flycatchers. c) an innate change of biological clock by caterpillars. d) global warming. e) a decrease in the amount of calcium in the ecosystem.
The most likely cause for the shift in caterpillar peak mass is pesticide use.
How do you keep caterpillars in check?
Picking caterpillars off plants and dropping them into a bucket of soapy water or squeezing them is one of the easiest methods for controlling them. This technique takes time and persistence, and not everyone enjoys being hands-on with pest control. Another possibility is to encompass crops with insect-resistant fabrics.
The mode of action of a pesticide is defined as its action at its target site. In other words, a pesticide's mode of action is the method by which it causes physiological disruption at its target site.
Therefore, the concepts of pesticide class, target site, and mode of action are inextricably linked to the cause of the shift in caterpillar peak mass.
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As time goes on, what happens to the potential difference across the membrane of this single segment?.
As time goes on, what happens to the potential difference across the membrane of this single segment exponentially decays to its minimum value. The membrane is comprised of a very specific manner of chemicals and organelles which focuses on the improvement of the whole process, or mechanism of the transportation of the materials across the membrane. The potential difference across the membrane of this single segment will exponentially decay to its minimum value.
suppose two competing species are more morphologically similar when their ranges are far apart compared to where they compete with each other in the same range. this is an example of...
Character displacement is an example of two competing species are more morphologically similar when their ranges are far apart compared to where they compete with each other in the same range.
Character displacement refers to an evolutionary change that happens when two closely related species coexist in the same environment. Natural selection is more likely to encourage divergence in an organism's morphology, ecology, behavior's, or physiology under such circumstances. The theory was only formally recognized in the middle of the 20th century, but it has been known at least since the English naturalist Charles Darwin (1809–1882) began putting together his case for evolution. Despite the fact that some of the same species were indistinguishable while living allopathically, they discovered that sympatric species possessed a variety of unique characteristics. Because the species were similar, they competed for the same resources, and natural selection preferred those species that competed less, according to Brown and Wilson. As a result, the characters changed.
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You know that alleles are alternative versions of a gene. What makes alleles different from each other?.
The differences in the linear order of nucleotides make alleles different from each other, thereby involving different gene sequences which may also be linked to differential phenotypes.
What is an allele?An allele is a gene variant that is found in the same chromosome location (i.e. locus). The gene variants or alleles are different because they have different nucleotide sequences, which may produce differences in a phenotype.
Therefore, with this data, we can see that alleles are different forms of a gene associated with distinct nucleotide sequences, which may be associated with differences in a given phenotype.
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The coils of a radiator provide a large surface area from which heat is radiated into a room. Which organelles have a structure similar to that of a radiator? How is their structure related to their function? Answer in 5 to 7 sentences
With more surface area, the cell may more effectively use the transport of nutrients and heat into its interior organelles.
What Are in Cell Organelles?An organelle is a subcellular structure that, like an organ in the body, has one or more specific tasks to carry out within the cell. The nucleus, which house genetic material, the mitochondria, which generate chemical energy, and the ribosomes, which put together proteins, are some of the more significant cell organelles. Small cytoplasmic structures known as organelles perform tasks required to keep the cell's homeostasis in check. They play a role in a variety of functions, including the synthesis of proteins and secretions, the removal of toxins, and the processing of outside signals.To learn more about Cell Organelles refer :
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You want to cultivate some exotic plants at your farm however the climate is chillier than the temperature range favorable to the crop which is the best method to use for the cultivation of this exotic crop
To cultivate some exotic plants when the climate is chillier than the temperature range favorable to the crop, the best method to use for the cultivation of this exotic crop is adopting "greenhouse".
What is a greenhouse?
Greenhouse, as the name suggests, is a simple building with a transparent or opaque roof design built for the production and protection of crops against the influence of unsuitable environmental conditions.
Using greenhouse to grow the exotic crop would bridge the gap created by difference in environmental conditions.
In summary, greenhouse cultivation makes it possible to grow the exotic crop in a chiller environment that wouldn't otherwise be able to grow. It creates a suitable ecosystem for the crop regulating climatic factors that would have affected it
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______ is nondestructive and creates radioactive decay paths than can be identified and used to date archeological specimens, gunshot residue, arsenic in hair, and geographic locations
Radioactive decay is nondestructive and creates radioactive decay paths that can be identified and used to date archeological specimen, etc.
What is radioactive decay ?Ionizing radiation is produced by radioactive decay. Ionizing radiation alters the atoms in living things, which causes damage to tissue and genes. Alpha particles may be present in the released ionizing radiation.
Atomic nuclear decay is significant because it produces radioactivity. As a result, it is a process that can be used to produce energy and in medicine. Satellites, medical imaging, individualized cancer treatments, radiometric dating, and investigations into the nature and origin of things all benefit from radioactivity.
As a result, radioactivity is nondestructive and produces radioactive decay pathways that can be recognized and used to date objects like archeological specimens, gunshot residue, arsenic in hair, and geographic locations..
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If a mutation in the DNA group of an organism results in the replacement of an amino acid containing a polar r-group with another amino acid containing a nonpolar R-group, how might the structure of the protein be affected?
The primary structure of proteins would change as a result of these substitutions because the sequence of the amino acid chain would be altered.
Because of the decrease in amino acids, the replacement would affect the amount and placement of hydrogen bonds in the secondary structure. Because of the addition of the polar R-group, the tertiary structure's hydrophobic bonds would change. Because of the replacements, the quarternary structure would change and take on a new shape.
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Which statements about sex-limited traits are true?
Genes for the trait are present in both genders.
Growing a beard in males is an example of a sex-limited trait.
The traits aren’t expressed physically.
Developing green eyes is an example of a sex-limited trait.
Answer:
2
Explanation:
if I'm wrong the green eye thing is 100% wrong
k leak channels are found in the plasma membrane. these channels open and close in an unregulated, random fashion. what do they accomplish in a resting cell
K+ ions can readily exit the cell through K+ leak channels in accordance with the K+ concentration gradient created by pumps. Theoretically, these channels would allow K+ to enter the cell if there was a higher concentration of the ion outside the cell.
Do potassium channels that are leaky ever close?While potassium leak channels enable potassium ions to permeate outside the cell, sodium leak channels further enhance the influx of sodium ions. The leak channels are constantly open, regardless of whether the neuron is at the resting membrane potential, depolarizing, repolarizing, or hyperpolarizing.
Ions can only travel through the membrane through a certain ion channel when it is open, according to an ion channel. The ion goes down its concentration gradient from high to low as a result of the ion channel opening; in this situation, K+ flows from the inside (intracellular area) to the outside (extracellular region).
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Humans have promoted the evolution of insects that are resistant to insecticides by.
