Ribose-5-phosphate is produced by oxidative decarboxylation of 6-phosphogluconate using the enzyme glucose-6-phosphate dehydrogenase. O True O False
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- Study Figure 19.18 and decide which of the following statements is false. Pyruvate dehydrogenase is inhibited by· NIADH. Pyruvate dehydrogenase is inhibited by AΤΡ. Citrate synthase is inhibited by NADH. Succinyl-CoA activates citrate synthase. Acetyl-CoA activates pyruvate carboxylase.When acetyl-CoA oxidized via the citric acid cycle, yields 10 ATP equivalents: 3 NADH, 1 FADH2, and 1 ATP or GTP. a. False b. TrueCHOOSE THE CORRECT LETTER 1.Which of the following enzymes catalyze the reaction involved in the production of FADHy in the Kreb's cycle?A. malate dehydrogenaseB. a-ketoglutarate dehydrogenaseC.isocitrate dehydrogenaseD. succinate dehydrogenase 2.Steric acid requires eight cycles of B-oxidation to be completely converted to acety/-CoA.A.TrueB. False
- Which glycolysis reactions are catalyzed by the following enzymes?(a) Pyruvate kinase(b) Glyceraldehyde 3-phosphate dehydrogenase(c) Hexokinase(d) Phosphoglycerate mutase(e) AldolaseThe conversion of glyceraldehyde-3-phosphate to 1,3-bisphosphoglycerate is the only oxidative reaction of glycolysis. True or false?Which of the following is NOT a component of the pyruvate dehydrogenase complex? a. dihydrolipoyl dehydrogenase b. dihydrolipoyl transacetylase c. pyruvate dehydrogenase d. dihydrolipoyl catalase
- Which of the following citric acid cycle enzymes catalyzes substrate-level phosphorylation? A) isocitrate dehydrogenase B) α-ketoglutarate dehydrogenase C) succinyl CoA synthetase D) succinate dehydrogenase E) malate dehydrogenaseTrue or False c. Glycogen synthase catalyzes the synthesis of α-1,6 linkages. True False d. The activated form of glucose is added to the non-reducing end of glycogen molecules. True FalseWhich of the following enzymes are required for the shown reaction?a. a-ketoglutarate dehydrogenaseb. dihydrolipoyl dehydrogenasec. Both a and bd. Neither a nor b
- What enzyme will be used if only the non-oxidative portion of the pentose phosphate pathway is operating to produce ribose 5-phosphate? a) 6-phosphogluconate dehydrogenase b) 6-phosphoglucono-lactonase c) glucose 6 phosphate dehydrogenase d) transketolaseDuring strenuous exercise, the NADH formed in the glyceraldehyde 3-phosphate dehydrogenase reaction in skeletal muscle must be reoxidized to NAD+ if glycolysis is to continue. The most important reaction involved in the reoxidation of NADH is: a. dihydroxyacetone phosphate → glycerol 3-phosphate b. glucose 6-phosphate → fructose 6-phosphate c. isocitrate → α-ketoglutarate d. oxaloacetate → malate e. pyruvate → lactatetrue/false: The cofactor ATP is essential in all transamination reactions.
