Due to variations in the cell wall, prokaryotes can either stain gram-positive or gram-negative.
Why are prokaryotes gram-positive or gram-negative stained?The thick, peptidoglycan coating of gram-positive bacteria's cell walls will hold onto the dye, causing them to stain violet. The bacteria will stain red if they are gram-negative and the dye leaks through the thin peptidoglycan coating.
What distinguishes gram-positive bacteria from gram-negative bacteria?The hue of a Gram stain is purple. The bacteria in a sample will either stay purple or turn pink or red when the stain and bacteria combine.
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11. explain what probably caused the increase in the pecentage of white rabbits. interpreting observations
Natural selection caused the increase in the percentage of white rabbits.
Natural selection is most likely to blame for the increase in the percentage of white rabbits. The hawks would not have been able to see the rabbits in the winter because of their white coat. As a result, the hawks would have mostly killed dark gray rabbits.
Natural selection is the process by which living organism populations adapt and change. Individuals in a population are naturally variable, which means they differ in some ways. This variation indicates that some people have traits that are better suited to their environment than others.
Natural selection is the mechanism proposed by Darwin for evolution. Because resources are limited in nature, organisms with heritable traits that favor survival and reproduction leave more offspring than their peers, causing the traits to become more common over generations.
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How does photosynthesis connect to cells and transport? Explain.
Answer:
Photosynthetic electron transport is the first stage of photosynthesis that produces chemically stored energy and uses solar photons to drive electron transport against a thermodynamic gradient.
according to kinetic molecular theory, gas particles: select the correct answer below: exert attractive forces amongst one another exert repulsive forces amongst one another exert both attractive and repulsive forces amongst one another none of the above
None of the above. Between gas particles or between the particles and the container walls, there is no force of attraction. Gas particle collisions and impacts with the container's walls are both fully elastic.
The observed correlations between a gas's pressure, volume, and temperature are frequently not ideal, which means that the gas laws do not fully capture these interactions. The causes of these departures from the behavior of an ideal gas are taken into account in this section.
Gas molecules behave almost exactly like ideal gas particles at relatively low pressures because they are (on average) so widely apart and have virtually no attraction for one another. However, the force of attraction is also no longer negligible at higher pressures. This force marginally reduces the pressure (assuming the volume is constant) or decreases the volume by drawing the molecules closer together (at constant pressure). Due to the molecules' lower KE in comparison to the attractive forces, which makes them less able to overcome these forces after interacting with one another, this change is more pronounced at low temperatures.
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what event that occurred around 10,000 years ago led to genetic changes in wheat? a) domestication of livestock b) mass extinction of herbivores c) domestication of the wheat plant d) invention of genetic engineering
Domestication of the wheat plant occurred around 10,000 years ago and resulted in genetic changes in wheat. The correct answer is option(c).
Domestication is a maintained multi-generational connection at which point persons assume an important strength of control over the duplication and care of another group of creatures to secure a more certain supply of possessions from that group.
The preparation of wheat about 10,000 before apparent an exciting retire the happening and development of human civilization, as it allowed the change from a chaser-hoarder and itinerant peaceful association to a more lazy agrarian individual. Domestication of the wheat plant occurred around 10,000 years ago and resulted in genetic changes in wheat.
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in positive control of several sugar-metabolism-related operons, the camp receptor protein (crp) binds to dna to stimulate transcription. which of the following events activates crp? in positive control of several sugar-metabolism-related operons, the camp receptor protein (crp) binds to dna to stimulate transcription. which of the following events activates crp? increase in glucose and decrease in camp decrease in glucose and increase in repressor increase in glucose and increase in camp decrease in glucose and increase in camp
A protein called CRP (cAMP receptor protein) is present in bacteria. A regulatory protein, that is.
When CRP binds to cAMP, a conformational shift occurs that causes CRP to bind to particular locations on DNA promoters. This interacts with RNA polymerase to activate transcription. CRP activity increases in response to a drop in glucose and a rise in cAMP. When glucose acts as a carbon source, cAMP levels are low. This results from the adenylate cyclase enzyme being inhibited (cAMP producing enzyme). Therefore, a drop in glucose will result in an increase in cAPM.
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In snapdragons, the allele for red flower color (CR) is incompletely dominant to the allele for white flower color (CW). Snapdragons that are heterozygous for flower color have a pink phenotype.
Which of the following crosses could yield all three flower color phenotypes (red, white, and pink) among the offspring?
A. CROR × CWCW
C. CROW × CROW
B. CRCR × CROW
D. CROW × CW CW
RW X RW. Since they are both heterozygous, all phenotypes will be displayed when we build a prunnet square with the choices RR RW RW and ww.
What about snapdragons?Because of their imagined similarity to a dragon's face that opens and closes its mouth when laterally pinched, plants in the Antirrhinum genus are also known as dog flowers, snapdragons, and dragon flowers.They are indigenous to rocky regions in North Africa, the United States, Canada, and Europe.Although some species are annuals, most samaras are short-lived perennials. Typically lance-shaped, the simple leaves. The main pollinators, which are strong bees, can force the mouth of the tubular, bilaterally symmetrical, typically large flowers to open, excluding the majority of insects.While snapdragons can bloom continuously throughout the year, they do best in the chilly months of spring and fall.They occasionally bloom all through the winter in milder climates, where they occasionally bloom all summer long in cooler ones. Usually grown as annuals, these short-lived perennials.Learn more about snapdragon here:
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microscopic examination of cerebrospinal fluid reveals gram-positive rods. what is the organism? group of answer choices streptococcus listeria naegleria haemophilus neisseria
Listeria is the microscopic examination of cerebrospinal fluid reveals gram-positive rods.
cerebrospinal fluid reveals -CSF (shown in blue) is produced by the tissue that lines the ventricles (hollow spaces) in the brain. It circulates in and around the brain and spinal cord, protecting and nourishing them.
Listeria is a bacterial genus that lives as an intracellular parasite in mammals. Until 1992, there were 17 species known, each with two subspecies. 21 species had been identified by 2020. The genus is named after the British sterile surgery pioneer. Lister, Joseph
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Is the study of biological diversity and the evolutionary relationships among organisms.
Systematics is the study of biological diversity and the evolutionary relationships among organisms.
The study of biological diversity and the relationships between organisms is commonly defined as sytematics. Taxonomy, the component of systematics that focuses on the theory and practice of classification, is not easily distinguished, and biologists frequently use the terms interchangeably. Systematics is important in biology because it allows us to characterize the organisms we study.
Reptiles, for example, are animals that lay eggs and have scales, whereas mammals are animals that have live births and have fur or hair. All humans, more specifically, share the same characteristics and thus belong to a group, or taxon, of the genus Homo and species sapien.
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Information received by sensory cells is conveyed to the central nervous system in the form of impulses along afferent fibers. In order for this to happen when the receptor cell is not a neuron, its receptor potential ______.
Information received by sensory cells is conveyed to central nervous system in the form of impulses and for this to happen when the receptor cell is not a neuron, its receptor potential must be transferred to a neuron.
What is neuron?Neurons are information messengers and they use electrical impulses and chemical signals to transmit information between different areas of brain, and between the brain and rest of the nervous system.
The most common brain cells are neurons and non-neuron cells are called glia. The average adult human brain contains of 100 billion neurons and glia. Although neurons are most known brain cells but both neurons and glial cells are necessary for proper brain function.
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what determines the difference in speed of contraction of the different types of skeletal muscle cells?
Muscle fibers can be divided into two general categories: Category I, which is sluggish, and Type II, which is quick.There are three primary fiber types in type II, which is further divided into type IIA (oxidative) and type IIX (glycolytic).These fibers exhibit comparatively unique features in terms of metabolism, contractility, and motor units.
Which cell types make up skeletal muscle?These cells to make up muscular tissue are referred to as myocytes, or muscle cells.The human body contains three different types of muscle cells: cardiac, skeletal, or smooth.
How many different types of cells exist?Your body has roughly 200 different kinds of cells.These cells help to build your tissues and organs as well as your immune system, which works to protect your body.Your body regularly replaces its dead cells with new ones.
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Brett learned that his car is better protected from the weather when it has been recently washed and waxed. Which best describes the major group of macromolecules that is protecting his car and how it is performing this task?.
Lipids are protecting his car because their nonpolar nature makes them insoluble in water.
What is meant by lipids and its functions ?Any of the countless chemical compounds that are soluble in oil but not in water is a lipid. They include lipids, waxes, oils, hormones, and some membrane components and act as chemical messengers and energy storage molecules.
Lipids are substances that contain hydrocarbons and are used for a range of functions, including as energy storage, as structural components, and even in cell signalling. In the homeostatic system of the human body, lipids and fats have a significant impact.
A wax is a simple lipid that is an ester of an alcohol and long-chain fatty acid. Between 12 and 32 carbon atoms are possible in alcohol. Stems and leaves naturally have a waxy coating. Because of this, the plant doesn't lose a lot of water.
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Mendel was able to see experimentally that the traits he studied were not blended in the offspring because he studied continuous variation. True False
The statement is False because Mendel was able to see experimentally that the traits he studied were not blended in the offspring as he studied discontinuous variation.
Discontinuous variation is the variation seen among individuals when each individual shows one of two or very few easily distinguishable traits, such as violet or white flowers. Mendel's choice of these kinds of traits allowed him to see experimentally that the traits were not blended in the offspring as expected at the time, but that they were inherited as distinct traits.
Pure-bred plants did not give rise to offspring with mixed traits, as Mendel discovered. Generally speaking, children seem to inherit traits from both of their parents. According to Mendel, the elements that influence a trait are found in pairs. According to Mendel's experiments, a child's traits are a combination of those of the parents.
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the designation for the renal arrangement of structures that facilitates the movement of solutes between blood vessels is called the
The kidney's renal artery filtering organ, the glomerulus, is a unique collection of capillaries that is sandwiched between two resistance vessels. The only capillary beds in the body that are not bordered by interstitial tissue are these capillaries, which are all confined within the Bowman's capsule.
The renal artery initially separates into segmental arteries, then it continues to branch to create interlobar arteries, which then go via the renal artery columns to the capillaries ,cortex. The interlobar arteries subsequently divide into afferent arterioles, capillaries arcuate arteries, and cortical radiate arteries.
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in the gi tract, a food bolus is converted into a semiliquid mass of partly digested food and digesteive secretions known as
In the Gi tract, a food bolus is converted into a semiliquid mass of partly digested food and digestive secretions known as chyme.
What is bolus?
Saliva combined with food after it has been chewed. Food particles are chemically reduced, hydrated for taste, and lubricated for easy swallowing when chewed to a size that can be easily swallowed. Saliva contributes digestive enzymes, water, and mucus that help in these processes.
What is digestive tracts?
The release of water, acids, enzymes, buffers, and salts is known as secretion in the digestive tract. digestive tract epithelium.
Food is transformed into chyme, a semi-liquid state that can be digested, from which it can be consumed (mixture of partly digested food and digestive secretions).
Therefore, e Gi tract, a food bolus is converted into a semiliquid mass of partly digested food and digestive secretions known as chyme.
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what chemical reaction absorbs energy
Choose the answer that lists the steps involved in the depolarization of a neuron during an action potential in the correct order.
1. Action potential stimulus.
2. Active transport of sodium and potassium ions.
3. Inactivation gates close.
4. Movement of potassium ions out of the cell.
5. Movement of sodium ions into the cell.
6. Opening of potassium channels.
7. Opening of sodium activation gates.
help meeeeeeeeeeeeeeee pleaseeeeeeehelp meeeeeeeeeeeeeeee pleaseeeeeeehelp meeeeeeeeeeeeeeee pleaseeeeeeehelp meeeeeeeeeeeeeeee pleaseeeeeeehelp meeeeeeeeeeeeeeee pleaseeeeeeehelp meeeeeeeeeeeeeeee pleaseeeeeee
Answer:
1. C
2. A
3. B
100% right
Explanation:
1.D
2.A
3.B
I hope it's useful
q4.1. without mutations, and with no crabs present, snails produce offspring that have the same shell thickness as themselves (they clone themselves). will this change when you add crabs? why or why not?
No, because there is no mechanism for a snail to produce offspring with a different shell thickness from itself, thus the answer option (D).
The population does not experience changes in shell thickness. Some snails in the population experience changes in shell thickness.
Predators are creatures that go on the search for prey to eat. There are various creatures that prey on crabs, including otters, alligators, fish, and even shrimp (they eat the larvae). Predators are animals that hunt other animals or living things for food, whereas prey is little animals or organisms that eat the food that the predator leaves behind after it has eaten it.
The interaction between the predator and the prey is represented in the ecosystem by a food chain, sometimes referred to as a food web. For the ecosystem's food chain to function properly and keep the population in check.
The complete question is:
Without mutations, and with no crabs present, snails produce offspring that have the same shell thickness as themselves (they clone themselves). will this change when you add crabs? why or why not?
(A). Yes, now snails will grow thicker shells to protect themselves and they will pass these thicker shells to their offspring.
(B). Yes, now snails will try to protect their offspring from crabs by making offspring with thicker shells.
(C). Yes, the population will evolve thicker shells through natural selection.
(D). No, because there is no mechanism for a snail to produce offspring with a different shell thickness from itself.
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If a baby is born prematurely before type II cells produce sufficient pulmonary surfactant, which of the following might you expect? a. difficulty expressing fluid b. difficulty inflating the lungs c. difficulty with pulmonary capillary flow d. no difficulty as type I cells can provide enough surfactant for normal breathing
Premature birth causes pulmonary inflation difficulties because type II cells are unable to create enough pulmonary surfactant.
What use does pulmonary surfactant serve?It is known that pulmonary surfactant lowers surface tension in the alveoli at the air-water interface, limiting the collapse of these structures at end-expiration. Surfactant lessens the effort required for breathing in this way.
How can surfactant stop the collapse of the lungs?The lung cells exude surfactant, which distributes throughout the alveolar tissue. This chemical reduces surface tension, which facilitates easy breathing by preventing the collapse of the alveoli following exhalation. A complex mixture of proteins and phospholipids called pulmonary surfactant works to lower surface tension at the alveolar-air interface, preventing atelectasis.
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the gastroenterologist has just determined that you have a blockage in your jejunum and he will have to perform surgery, making a small incision in the wall to remove the obstruction. which tunic will be cut first? submucosa mucosa adventitia serosa tunica muscularis
The gastroenterologist has just determined that you have a blockage in your jejunum and he will have to perform surgery, making a small incision in the wall to remove the obstruction. Serosa tunic will be cut first.
The outer lining of the abdominal and thoracic organs and cavities, including the stomach. Also called serous membrane.
The serosa (or serosa) is a smooth tissue membrane of mesothelium that lines the contents and inner walls of body cavities that secretes serous fluid, allowing lubricated gliding motion between opposing surfaces.
Serosa, or serous membrane, is a thin membrane that lines body cavities and organs such as the heart, lungs, and abdominal cavity. The thin membrane is composed of mesothelium tissue derived from the mesoderm.
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maraviroc is being considered as part of a salvage antiretroviral regimen and an hiv tropism coreceptor assay is ordered. what result is required for maraviroc to be considered appropriate for use?
R5-tropic HIV is required for maraviroc to be considered appropriate for use.
Maraviroc is used in conjunction with other medications to treat human immunodeficiency virus infections (HIV). The virus that causes AIDS is known to induce a lack of immune system function (AIDS). Patients who have previously undergone HIV treatment typically receive this medication.
The kind of HIV that attaches to the CD4 cell's CCR5 coreceptor before entering and infecting the host cell. HIV must first bind to a CD4 receptor, then to either the CCR5 or CXCR4 coreceptor, and ultimately fuse its membrane with the membrane of the CD4 cell in order to enter a CD4 cell. During the initial stages of infection.
Hence, maraviroc uses of R5-tropic HIV for mechanism of action.
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Which cli-based configuration should you provide on the router to enable it to send data to cisco dna center?
The telemetry profiles set up in this procedure are used by Cisco DNA Center to choose which telemetry types to capture. The health of network devices is then monitored using these data types.
your intent-based network for the enterprise is called Cisco DNA Center. All of your network devices can be provisioned and configured in a matter of minutes. To proactively monitor, troubleshoot, and optimize your network, use cutting-edge artificial intelligence (AI) and machine learning (ML).
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some members of the ecdysozoa (select all that apply): a. secrete a cuticle made of protein. b. secrete a cuticle made of calcium carbonate. c. molt during growth. d. have trochophore larvae. e. have lophophores.
Some members of the ecdysozoa Secrete a cuticle made of protein and Molt during growth. The correct answer is options (b) and (c).
Ecdysozoa is a group of protostome mammals, containing Arthropoda, Nematoda, and various tinier phyla. They were first outlined by Aguinaldo and others. in 1997, located primarily on ethnic timbers built utilizing 18S ribosomal RNA genes.
The most notable characteristic joint by ecdysozoans is a three-coat with metallic material cuticle (four in Tardigrada) calm of natural material, that is rhythmically molted as the animal evolves. A cuticle, or cuticula, is one type of tough but responsive, non-not organic external covering of an animal, or parts of a structure, that determine care. Various types of "cuticles" are non-similar, disagreeing in their inception, building, function, and synthetic arrangement.
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tients with pyruvate dehydrogenase deficiency show high levels of lactic acid in the blood. however, in some cases, treatment with dichloroacetate (dca) lowers lactic acid levels. dca targets the activity of pyruvate dehydrogenase kinase (pdk). identify how dca acts to stimulate p
DCA inhibits private dehydrogenase kinase.
Pyruvate dehydrogenase deficiency is characterized by lactic acid buildup in the body and a variety of neurological problems. This condition's signs and symptoms typically appear shortly after birth and can vary greatly between affected individuals.
PDCD is most commonly caused by mutations in the gene encoding the E1 alpha subunit, also known as the E1-alpha subunit pyruvate dehydrogenase gene or PDHA1. There are numerous PDCD-causing abnormalities in the PDHA1 gene, also known as PDHA1 variants. PDC deficiency is diagnosed using laboratory tests such as blood tests, urine analysis, and brain MRI. The pyruvate dehydrogenase enzyme can be used to confirm the diagnosis.
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g glycolysis is the name given to a metabolic pathway occurring in many different cell types. it consists of 11 enzymatic steps that convert glucose to lactic acid. glycolysis is an example of:
In glycolysis when glucose is converted to lactic acid. This is an example of fermentation.
Fermentation begins with glycolysis, but it does not involve the latter two stages of aerobic cellular respiration which is the Krebs cycle and oxidative phosphorylation. In lack of oxygen, pyruvate will undergo a process called fermentation. In the process the NADH+ H+ from glycolysis will be recycled back to NAD+ so that glycolysis can continue. In the process of glycolysis, NAD+ is reduced to form NADH+ H+ . The final product of glycolysis is pyruvic acid in aerobic condition. And forms lactic acid in anaerobic condition which is also termed as fermentation.
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Complete question- Glycolysis is the name given to a metabolic pathway occurring in many different cell types. It consists of 11 enzymatic steps that convert glucose to lactic acid. Glycolysis is an example of: A) aerobic metabolism. B) anabolic metabolism. C) a net reductive process. D) fermentation. E) oxidative phosphorylation.
Your tongue is covered in bumps called papillae. Papillae have taste receptors that are bundled together (taste buds). Taste buds have microscopic hairs called microvilli which send nerve impulses to the brain. However, your nose plays a role too! While you’re chewing, the food releases chemicals that travel up your nose and trigger olfactory receptors which also send nerve impulses to the brain to help you interpret the true flavor of what you’re eating. With this information, explain why a cold or allergies can diminish the flavor of your food.
During eating, the tongue and nose receptors collaborate to send signals to the brain that can provide an idea of the flavor. When one has a cold, the nose does not work well enough to detect smell of the food.
What is the role of receptors in the body?Many receptors on various cell types function differently, such as the tongue receptor, which sends food taste information to the brain. The nose receptors send the food smell to the olfactory region of the brain, but when a person becomes allergic or cold, the nose receptors stop working properly, and the smell does not reach the brain.
Hence, due to these reasons, the nose cannot smell and the person gets little flavor from the food.
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adenoviruses are a family of highly contagious viruses that most commonly cause illnesses of the respiratory system, such as bronchitis or pneumonia. in the first phase of an adenovirus infection, the host cell expresses several viral proteins. one of these proteins, e1b-55k, inhibits the activity of the host protein p53, a tumor suppressor that arrests the cell cycle or induces apoptosis when dna damage is detected. which of the following claims is best supported by the information above?
The majority of adenovirus infections result in the common cold and other minor respiratory illnesses.
A number of ailments, including bronchitis (an inflammation of the windpipe and major airways), pneumonia (an inflammation of the lungs), skin rashes, conjunctivitis (pink eye), bladder infections, and bowel infections, can be brought on by certain infections.
Adenovirus type 5 (Ad5early )'s region 1B (E1B) encodes at least five distinct polypeptides that are created by alternative splicing of a single mRNA precursor.
E1B-19K and E1B-55K, two of these gene products, both have the ability to work with the Ad5 E1A proteins to totally convert rodent cells in culture. Strong evidence points to the two E1B proteins' ability to combat growth arrest and apoptosis, which both inhibit cell transformation.
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By bombarding the fungus neurospora crassa with x-rays, beadle and tatum were able to study __________ and characterize enzymes in a __________.
Beadle and Tatum studied nutritional mutants and characterized enzymes in a biochemical pathway by irradiating the fungus Neurospora crassa with x-rays.
What two important conclusions came from Beadle and Tatum's research?With the help of genetic and biochemical investigations of the bread mold Neurospora, Beadle and Tatum were able to validate Garrod's theory. Mutants of bread mold that couldn't produce particular amino acids were found, according to Beadle and Tatum. A mutation has "broken" an enzyme required to synthesize a certain amino acid in each case.
What did Beadle and Tatum's work on Neurospora demonstrate?Through research on the red bread mold Neurospora crassa, George Beadle and Edward Tatum established the "one gene, one function" principle by demonstrating that genes act by controlling different chemical reactions.
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The process of two species changing genetically in response to long-term interactions with each other is.
Coevulation is the process through which two species undergo genetic change in response to ongoing contact. The most general definition of coevolution is when two groups of organisms influence one other's evolution in opposite directions.
What is an example of coevolution?One of the most prevalent instances of coevolution is the predator-prey relationship. In this sense, there is a selective pressure on the prey to evade capture, necessitating the evolution of the predator into a more proficient hunter.
Why does coevolution occur?This concept's underlying "game theory" may involve competition between species (as in interspecific competition) or within species (as in competition between various morphs of the same species) for resources like food or females.
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describe the mechanism by which atp synthase makes atp. when the beta subunit is in the loose conformation, it may contain atp.
The given statement is False.
What is the mechanism of ATP synthase?
The ATP synthase is a mitochondrial enzyme localized in the inner membrane, where it catalyzes the synthesis of ATP from ADP and phosphate, driven by a flux of protons across a gradient generated by electron transfer from the proton chemically positive to the negative side.
What does the beta subunit do in ATP synthase?
The alpha- and beta-subunits of membrane-bound ATP synthase complex bind ATP and ADP: beta contributes to catalytic sites, and alpha may be involved in the regulation of ATP synthase activity. The sequences of beta-subunits are highly conserved in Escherichia coli and bovine mitochondria.
What are the 3 major mechanisms by which ATP is generated?
In general, the main energy source for cellular metabolism is glucose, which is catabolized in the three subsequent processes—glycolysis, tricarboxylic acid cycle (TCA or Krebs cycle), and finally oxidative phosphorylation—to produce ATP.
Therefore, the given statement is False.
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