NADH is generated at which of the following enzyme site(s) in the citric acid cycle? OA) Aconitase. OB) Succinate dehydrogenase. OC) Fumarase. OD) All of the above. OE) None of the above.
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- Citric acid cycle is also considered to be an anabolic pathway, because: a) Some of the reactions in citric acid cycle are reversible b) Some of the intermediates in citric acid cycle can be converted to amino acids c) Bothaandb d) Neither a nor bThe citric acid cycle enzyme at which FADH2 is generated is: A) isocitrate dehydrogenase. B) x-ketoglutarate dehydrogenase. C) succinate dehydrogenase. OD) malate dehydrogenase.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 dehydrogenase
- 1- Catalyzes the production of FADH, in the Krebs cycle: a) isocitrate dehydrogenase b) c) fumarasa aconitase d) a-ketoglutarate dehydrogenase e) succinate dehydrogenase 2- In the Krebs cycle (a single cycle) the following are released: a) one molecule of CO, b) three molecules of NADH c) two FADH2 molecule d) two GTP 3- The enzyme that converts citrate to isocitrate is known What: b) isocitrate dehydrogenase a) aconitase citrate synthetase d) citrate lyase e) fumarase c)During the metabolism of glucose in anaerobic cells, the enzyme lactate dehydrogenase is essential to allow glycolysis to continue. This enzyme catalyzes the reduction of pyruvate to lactate. Why is this so essential? OA) It lowers the pH. B) It re-oxidizes NADH to NAD+. C) Lactate stimulates hexokinase activity. D) Pyruvate inhibits pyruvate kinase.two of the reduced electron carriers in the citric acid cycle come directly from a) isomerization of citrate b) lactic acid fermentation under anaerobic conditions c) condensation of acetate to form long-chain fatty acid d) oxidative decarboxylations e) succinate dehydrogenase reaction
- Which of the following intermediates of the TCA cycle has 5 carbons? (Hint: You don't need to have memorized specific structures for this question, just recall what molecules the TCA cycle starts with and where in the cycle carbons are lost as CO2 ). a) Fumarate b) None of the above c) Succinyl CoA d) Citrate e) OxaloacetateWhy is the citric acid cycle the central pathway in metabolism? (Select all that apply.) a) Citric acid is the most wide-spread organic compound. b) Products of other pathways are reagents for it. c) Reagents for other pathways are intermediates of citric acid cycle. d) All pathways contain citric acid.|a) Explain why the citric acid cycle is considered to be the center of cellular metabolism. b) What are the substrates and products corresponding to one turn of the citric acid cycle? (no need for enzymes) c) Which steps of the citric acid cycle release CO2 as a product? Which steps produce NADH or FADH2? Which step produces GTP? d) How much ATP can be generated from glucose when the citric acid cycle is operating?
- Which of the following pair of substances are products of the citric acid cycle? a) Acetyl CoA and NADH b) Acetyl CoA and CO2 c) CoA-SH and FADH2 d) Citrate and CO21- The precursor to glycogen in the glycogen synthase reaction is: A) Glucose-1-P.B) Glucose-6-P.C) UDP-glucose.D) UTP-glucose. E) None of the above. 2- Aerobic respiration is a pathway involving a series of reactions.What is the final reaction in the pathway: A) the synthesis of ATP.B) the oxidation of cytochrome.C) the reduction of oxygen to water.D) the formation of carbon dioxide.The major control enzyme in glycolysis is: a) hexokinase b) phosphofructokinase c) aldolase d) pyruvate kinase In step 4, when fructose-1,6-biphosphate is cleaved, the two molecules formed are: a) GAP and DHAP b) GAP and 3-PG c) 3-PG and 2-PG d) PEP and pyruvate NAD is used in which step? A) conversion of DHAP to GAP b) conversion of GAP to 1,3-BPG c) conversion of 1,3-BPG to 3-PG d) conversion of PEP to pyrunate The number of ATP molecules formed at the substrate level in glycolysis is: a) 1 B) 2 c) 3 d) 5 The number of ATP molecules formed indirectly via oxidative phosphorylation in glycolysis is: a) 1 B) 2 c) 3 d) 5