Which two enzymes produce reducing equivalents without a loss of carbon in the TCA cycle? O Aconitase and citrate synthase Alpha-ketoglutarate dehydrogenase and isocitrate dehydrogenase Malate dehydrogenase and succinate dehydrogenase Alpha-ketoglutarate dehydrogenase and malate dehydrogenase Question 20.
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- Which of the following events does not occur during Krebs Cycle? Citrate synthase catalyzers the transfer of an acetyl group from acetyl coenzyme A to oxaloacetate to form citrate. Isocitrate dehydrogenase converts citrate to its isomer isocitrate. A carbon dioxide is released when alpha-ketoglutarate is oxidized to succinyl coenzyme A. The energy released from the conversion of succinyl coenzyme A to succinate is used to transfer a phosphate group to ADP to form ATP. During Krebs Cycle, succinate is oxidized to fumarate which is coupled to the reduction of FAD to FADH2. During electron transport, the electrons from FADH2 are transferred to coenzyme Q. Which of the following catalyzes these reactions? NADH dehydrogenase Succinate dehydrogenase FADH2 hydrogenase NADH hydrogenase reductaseWhich of the following enzymes does NOT take part in the TCA cycle? Succinate dehydrogenase. α-ketoglutarate dehydrogenase. Malate dehydrogenase. Glyceraldehyde-3-phosphate dehydrogenase. Isocitrate dehydrogenase.Which of the following Krebs cycle enzymes generates a molecule of FADH2 from FAD? a-ketoglutarate dehydrogenase pyruvate dehydrogenase isocitrate dehydrogenase malate dehydrogenase succinate dehydrogenase
- CHOOSE 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. FalseThe first enzyme in the Krebs cycle is theA.citrate synthaseB.pyruvate dehydrogenaseC. α- ketoglutarate dehydrogenase D.aconitaseWhich 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
- Select which of the following enzymes unique to glycolysis are also sites of regulation for glycolysis. Select all that apply. a) glyceraldehyde 3 P dehydrogenase b) PFK c) pyruvate kinase d) hexokinase e) enolase f) phosphoglycerate mutaseWhich of the following catalyzes a step that does NOT produce CO2? Group of answer choices alpha-ketoglutarate dehydrogenase complex malate dehydrogenase pyruvate dehydrogenase complex isocitrate dehydrogenase Citrate synthase is regulated by... Group of answer choices Concentrations of substrate and products Fructose-2,6-Bisphosphate Covalent modification Allosteric regulation by the levels of NADDHalpha-ketoglutarate dehydrogenase will do which of the following: Select one: a. Pyruvate is decarboxylated to become acetyl-CoA producing NADH and Carbon dioxide b. Succinate is oxidized to become fumarate forming FADH2 c. Succinyl-CoA becomes Succinate and forms one ATP molecule and Coenzyme A-SH d. Oxaloacetate combines with the acetyl from acetyl-CoA to produce Citric acid(citrate) e. Malate is oxidized to become oxaloacetate forming NADH f. Isocitrate and then decarboxylated and oxidized to produce alpha-ketoglutarate, Carbon dioxide and NADH g. Citrate is rearranged to become Isocitrate h. Fumarate is combined with water to become Malate i. alpha-ketoglutarate is oxidized and decarboxylated to produce Succinyl-CoA, Carbon dioxide and NADH
- In TCA cycle, the enzyme that contains an FAD prosthetic group is— malate dehydrogenase. succinyl-CoA synthetase. succinate dehydrogenase. isocitrate dehydrogenase. fumarase.Which of the following is true about comparing the α-ketoglutarate dehydrogenase complex and the pyruvate dehydrogenase complex? Group of answer choices They catalyze reactions that produce the exact same set of products They are both dehydrogenase complexes, but have very different structures They both catalyze reactions that oxidize NADH to NAD+ They both use the same E3 enzyme component Which of the following best describes stage 2 of the citric acid cycle? Group of answer choices ATP production by the electron transport chain production of acetyl CoA regeneration of oxaloacetate release of 2 carbons as carbon dioxideIf 14CO2 (radioactive carbon) were incorporated into the TCA cycle via the Pyruvate Carboxylase reaction which of the following molecules would contain radioactive carbon? a. Oxaloacetate b. Citric Acid c. Isocitrate d. Alpha-ketoglutarate e. Succinyl-CoA f .Succinate g. Fumarate h. Malate