Homework Answers
28. Option A is correct.
In exergonic reactions reactants have more free energy than the products hence reaction is accompanied with net release of energy. Exergonic reactions don’t require any energy from the surroundings and are spontaneous.
29. Option D is correct
Inorganic phosphate is sometimes transferred from the ATP to the substrate molecules during various biochemical reactions in the cell.
30. Option B is correct
Enzymes increase the rate of reaction by lowering the activation energy.
31. Option C is correct
Active site is the region in enzyme which is involved in the catalytic reaction of the enzyme.
32. Option B is correct
ATP generated during glycolysis is at the substrate level phosphorylation.
33. Option D is correct
Oxidative phosphorylation generates the most ATP during aerobic respiration through chemi-osmotic mechanism.
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28) Which of the following is true for all exergonic reactions? A)...
7) Why do hydrolysis reactions occur more readily in solution than dehydration reactions? A) Hydrolysis reactions...
7) Why do hydrolysis reactions occur more readily in solution than dehydration reactions? A) Hydrolysis reactions increase G, or Gibbs free energy of the system, B) Hydrolysis reactions are endergonic and increase entropy of the system. C) Hydrolysis reactions are exergonic and decrease entropy of the system. D) Hydrolysis reactions are exergonic and increase entropy of the system. 8) How do cells use the ATP cycle illustrated in the figure? AAA W A) Cells use the cycle to recycle ADP...
19. d. Pantothenic acid b. Riboflavin e. Thiamine C. Niacin How would a noncompetitive inhibitor interfere...
19. d. Pantothenic acid b. Riboflavin e. Thiamine C. Niacin How would a noncompetitive inhibitor interfere with a reaction involving the enzyme shown in Figure 1.1? a. It would bind to a. d. It would bind to b. b. It would bind to c. e. It would bind to d. It would be unable to bind because of its lack of a competitive nature. de. b. Enzyme Substrate Competitive Noncompetitive inhibitor inhibitor Figure 1.1. Enzymes and Inhibitors. 20. Most enzymes...
Thinking Through the Concepts Multiple Choice 1. Which of the following is True? a. Enzymes increase...
Thinking Through the Concepts Multiple Choice 1. Which of the following is True? a. Enzymes increase activation energy requirements. b. Activation energy is required to initiate exergonic reactions. Heat cannot supply activation energy. c. d. Stomach acid inactivates pepsin. 2. Which is not an example of an exergonic reaction? a. photosynthesis b. a nuclear reaction in the sun c. ATP → ADP + Pi d. glucose breakdown .3, which of the following is True? a. ATP is a long-term energy...
2.1.5 nM d. 3.0 nM 28. Which of the following about metabol following about metabolism is...
2.1.5 nM d. 3.0 nM 28. Which of the following about metabol following about metabolism is INCORRECT? a. Metabolic processes often couple ender processes maintaining the living state. b. Anabolism refers to that biomolecules are synthesi Processes often couple endergonic reactions of nutrient breakdown to the exergonic eters to that biomolecules are synthesized from simpler components. Sit is to break down nutrients and cell constituents to salvage components and/or generate energy d. All of the above are correct. 29. Which...
17) 17) Which of the following is true for all exergonic reactions? A) The reaction proceeds...
17) 17) Which of the following is true for all exergonic reactions? A) The reaction proceeds with a net release of free energy B) The reactions are rapid. C) The reaction goes only in a forward direction: all reactants will be converted to products, but no products will be converted to reactants. D) A net input of energy from the surroundings is required for the reactions to proceed. E) The products have more total energy than the reactants. 18 18)...
There are two sets of reactions in glycolysis in which phosphate intermediates are synthesized in...
There are two sets of reactions in glycolysis in which phosphate intermediates are synthesized in the first reaction and their energy harvested as ATP in the second reaction. Part A Identify the two sets of reactions. Check all that apply. O Step 1. Phosphorylation Step 2. Isomenzation Step 3. Phosphorylation Step 4. Cleavage Step 5, Isomerization Step 6, Oxidation and Phosphorylaton Step 7. Phosphate Transfer Step 8. Isomerization Step 9, Dehydration C) □ a Step 10. Phosphate Transfer We were...
Glyceraldehyde-3-phosphate dehydrogenase catalyzes the phosphorylation of glyceraldehyde-3-phosphate, but unlike other glycolytic reactions, it does not require...
Glyceraldehyde-3-phosphate dehydrogenase catalyzes the phosphorylation of glyceraldehyde-3-phosphate, but unlike other glycolytic reactions, it does not require energy investment from ATP. This reaction occurs in two stages: oxidation/reduction and phosphorylation. Why is the oxidation/reduction reaction necessary to make phosphorylation favorable? Choose one: A. The oxidation/reduction reaction is necessary to oxidize phosphate, allowing addition to the substrate. B. The oxidation/reduction reaction is necessary to form an intermediate with a large free energy of hydrolysis. C. The oxidation/reduction reaction is necessary to produce...
42. The end result of glycolysis includes the a creation of 38 molecules of ATP. b....
42. The end result of glycolysis includes the a creation of 38 molecules of ATP. b. reduction of eight molecules of NAD to NADH. c.formation of two molecules of pyruvate. d. conversion of one molecule of glucose to lactic acid. e. None of the above 43. During the energy investing portion of glycolysis, the phosphates from ATP molecules are a. added to the first and sixth carbons of glucose. b. added to the second and fourth carbons of glucose. c....
Which of the following statements regarding catabolic pathways are true? 1. When proteins are used as...
Which of the following statements regarding catabolic pathways are true? 1. When proteins are used as a source of energy for the body, the proteins are first broken down to produce amino acids, which are then converted into either glyceraldehyde 3 phosphate or acety CoA The enzyme phosphofructokinase is subject to allostericinhibition by high levels of citric acid When acety CoA builds up in the call it increases the activity of the enzyme that synthesizes oxalacetato from pyruvate and carbon...
28. Which one of the following statements is true? a) The brain b) Muscle cannot use...
28. Which one of the following statements is true? a) The brain b) Muscle cannot use fatty acids as an energy source. c) The brain exports ketone bodies as fuels for other tissues d) Fatty acids cannot be used as an energy source in humans e) as an energy source, but can use ketone bodies enzymes of the Glyoxylate cycle Heart muscle stores fuel as glycogen. 29. An intermediate found in gluconeogenesis and not in glycolysoxaloacetate a) 2-phosphoglycerate b) phosphoenolpyruvate...
7) Why do hydrolysis reactions occur more readily in solution than dehydration reactions? A) Hydrolysis reactions increase G, or Gibbs free energy of the system, B) Hydrolysis reactions are endergonic and increase entropy of the system. C) Hydrolysis reactions are exergonic and decrease entropy of the system. D) Hydrolysis reactions are exergonic and increase entropy of the system. 8) How do cells use the ATP cycle illustrated in the figure? AAA W A) Cells use the cycle to recycle ADP...
19. d. Pantothenic acid b. Riboflavin e. Thiamine C. Niacin How would a noncompetitive inhibitor interfere with a reaction involving the enzyme shown in Figure 1.1? a. It would bind to a. d. It would bind to b. b. It would bind to c. e. It would bind to d. It would be unable to bind because of its lack of a competitive nature. de. b. Enzyme Substrate Competitive Noncompetitive inhibitor inhibitor Figure 1.1. Enzymes and Inhibitors. 20. Most enzymes...
Thinking Through the Concepts Multiple Choice 1. Which of the following is True? a. Enzymes increase activation energy requirements. b. Activation energy is required to initiate exergonic reactions. Heat cannot supply activation energy. c. d. Stomach acid inactivates pepsin. 2. Which is not an example of an exergonic reaction? a. photosynthesis b. a nuclear reaction in the sun c. ATP → ADP + Pi d. glucose breakdown .3, which of the following is True? a. ATP is a long-term energy...
2.1.5 nM d. 3.0 nM 28. Which of the following about metabol following about metabolism is INCORRECT? a. Metabolic processes often couple ender processes maintaining the living state. b. Anabolism refers to that biomolecules are synthesi Processes often couple endergonic reactions of nutrient breakdown to the exergonic eters to that biomolecules are synthesized from simpler components. Sit is to break down nutrients and cell constituents to salvage components and/or generate energy d. All of the above are correct. 29. Which...
17) 17) Which of the following is true for all exergonic reactions? A) The reaction proceeds with a net release of free energy B) The reactions are rapid. C) The reaction goes only in a forward direction: all reactants will be converted to products, but no products will be converted to reactants. D) A net input of energy from the surroundings is required for the reactions to proceed. E) The products have more total energy than the reactants. 18 18)...
There are two sets of reactions in glycolysis in which phosphate intermediates are synthesized in the first reaction and their energy harvested as ATP in the second reaction. Part A Identify the two sets of reactions. Check all that apply. O Step 1. Phosphorylation Step 2. Isomenzation Step 3. Phosphorylation Step 4. Cleavage Step 5, Isomerization Step 6, Oxidation and Phosphorylaton Step 7. Phosphate Transfer Step 8. Isomerization Step 9, Dehydration C) □ a Step 10. Phosphate Transfer We were...
42. The end result of glycolysis includes the a creation of 38 molecules of ATP. b. reduction of eight molecules of NAD to NADH. c.formation of two molecules of pyruvate. d. conversion of one molecule of glucose to lactic acid. e. None of the above 43. During the energy investing portion of glycolysis, the phosphates from ATP molecules are a. added to the first and sixth carbons of glucose. b. added to the second and fourth carbons of glucose. c....
Which of the following statements regarding catabolic pathways are true? 1. When proteins are used as a source of energy for the body, the proteins are first broken down to produce amino acids, which are then converted into either glyceraldehyde 3 phosphate or acety CoA The enzyme phosphofructokinase is subject to allostericinhibition by high levels of citric acid When acety CoA builds up in the call it increases the activity of the enzyme that synthesizes oxalacetato from pyruvate and carbon...
28. Which one of the following statements is true? a) The brain b) Muscle cannot use fatty acids as an energy source. c) The brain exports ketone bodies as fuels for other tissues d) Fatty acids cannot be used as an energy source in humans e) as an energy source, but can use ketone bodies enzymes of the Glyoxylate cycle Heart muscle stores fuel as glycogen. 29. An intermediate found in gluconeogenesis and not in glycolysoxaloacetate a) 2-phosphoglycerate b) phosphoenolpyruvate...
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