46. Which of the following terms describes an enzyme that catalyzes electron tra
ID: 273526 • Letter: 4
Question
46. Which of the following terms describes an enzyme that catalyzes electron transfer reactions? (2 pt) a. dehydrogenase b. isomerase c. kinase d. phosphatase 47. In glycolysis, ATP is synthesized by (2 pt) a. substrate-level phosphorylation b. oxidative phosphorylation. e. photophosphorylation. d. both substrate-level and oxidative phosphorylation. e. all three of the above methods. 48. Which of the following is required for substrate-level phosphorylation? (2 pt) a. The substrate must contain multiple phosphate groups. b. Molecular oxygen must present. c. The standard free energy of the hydrolysis reaction is more negative than that for hydrolysis of the new phosphate compound being formed. d. All of the above are necessary for substrate-level phosphorylation. 49. Which enzyme catalyzes reaction the reaction shown? (2 pt) ADP ATP -OPO CH2 a. enolase b. pyruvate dehydrogenase c. pyruvate kinase d. phosphoglycerate mutase ? ? CHa 50. The reduction of pyruvate to lactate (2 pt) a. allows for recycling of NAD b. is the process that aids in the recovery of sore muscles after exercise. c. is accompanied by phosphorylation of ADP. d. does not occur in acrobic organisms.Explanation / Answer
46) The correct option is a. dehydrogenase.
Dehydrogenase explains an enzyme, which catalyzes electron transfer reactions.
47) The correct option is a. Substrate-level phosphorylation.
ATP can be synthesized by redox reactions, which use simple and complex lipids or carbohydrates as the source of energy. Each molecule of glyceraldehyde-3-phosphate converted to pyruvate and produces ATP. The pyruvate produced is used a substrate for the Kreb’s cycle.
48) The correct option is C. The standard free energy of the hydrolysis reaction is more negative than that for hydrolysis of the new phosphate compound being formed.
49) The correct option is C. Pyruvate kinase.
Pyruvate is formed and ATP is generated concomitantly. The irreversible transfer of a phosphoryl group from phosphoenolpyruvate to ADP is catalyzed by pyruvate kinase.
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