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Step by step
Solved in 5 steps
- Which of the following is a negative regulator of the pyruvate dehydrogenase complex (PDC)? 1. acetyl CoA 2. ADP 3. pyruvate 4. citrateWhich of the following stimulates the conversion of pyruvate to acetyl-CoA? a) Activation of pyruvate dehydrogenase kinase b) A decrease in the ratio of NAD+/NADH c) Bothaandb d) Neither a nor bWhich 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 dehydrogenase
- Which of the following is NOT a component of the pyruvate dehydrogenase complex? a. dihydrolipoyl dehydrogenase b. dihydrolipoyl transacetylase c. pyruvate dehydrogenase d. dihydrolipoyl catalaseA researcher has recently suggested that Pyruvate Dehydrogenase Complex could be source for acetate in the cell. Why would acetate production by the pyruvate dehydrogenase complex be highly unlikely to occur inside a cell.Which of the following reactions required dihydrolipoyl dehydrogenase? Oxidative decarboxylation of pyruvate Oxidative decarboxylation of a-ketoglutarate Both A and B Neither A nor B Fatty acid biosynthesis is stimulated by: Decreased levels of citrate Increased levels of palmitoyl-CoA Increased levels epinephrine Increased levels of AMP All of the above None of the above
- Explain the advantage to the cell of each of the following regulatory actions: a. The pyruvate dehydrogenase complex (PDC) is inhibited by ATP.b. Isocitrate dehydrogenase is stimulated by ADP.c. Pyruvate carboxylase is stimulated by acetyl-CoA.d. Citrate synthase is inhibited by NADH.e. PDC is inhibited by fatty acidsThe first enzyme in the Krebs cycle is theA.citrate synthaseB.pyruvate dehydrogenaseC. α- ketoglutarate dehydrogenase D.aconitaseWhich of the following enzyme catalyzes the conversion of pyruvate to lactate? Select one: a. Lactate reductase b. Pyruvate reductase C. Lactate dehydrogenase d. Pyruvate dehydrogenase
- Which glycolysis reactions are catalyzed by the following enzymes?(a) Pyruvate kinase(b) Glyceraldehyde 3-phosphate dehydrogenase(c) Hexokinase(d) Phosphoglycerate mutase(e) AldolaseCHOOSE 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. FalseIdentify the Krebs cycle enzyme that consumes a six-carbon substrate molecule, producing a six-carbon product molecule, but neither consumes nor produces NADH? A. a-ketoglutarate dehydrogenase B. isocitrate dehydrogenase C. succinyl CoA synthetase D. malate dehydrogenase E. aconitase