In beta-oxidation, which cofactor is required the for second oxidation reaction (conversion of beta-hydroxyacyl-CoA to beta-ketoacyl-CoA)? NAD+ water FAD CoA-SH
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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.Using the ActiveModel for enoyl-CoA dehydratase, give an example of a case in which conserved residues in slightly different positions can change the catalytic rate of reaction.Based on your knowledge of the structure of NAD+ and an assumption that coenzyme dissociation is the rate limiting step of the alcohol dehydrogenase mechanism, hypothesize why a N249W mutation at the coenzyme binding site would increase the rate of catalysis.
- How Do Vitamin-Derived Coenzymes Aid Metabolism? What chemical functionality is provided to enzyme reactions by pyridoxal phosphate (we Chapter 13)? By coenzyme A (see Chapter I9)? By vitamin B12 (see Chapter 23)? By thiamine pyrophosphate (see Chapter 19)?The Krebs cycle reaction shown below is catalyzed by __ enzyme and ___ pays for this reaction note only major metabolites are shown a. Synthetase, hydrolysis of acetyl CoA b. Synthase, hydrolysis of acetyl CoA c. Synthase, hydrolysis of NADH d. Synthetase, hydrolysis of ATPWhich 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
- Pyruvate dehydrogenase catalyzes the conversion of pyruvate to acetyl CoA. In this reaction, one molecule each of the catalytic coenzymes TPP, FAD and lipoamide participate in the reaction but are not consumed. OTrue O FalseThe conversion of pyruvate to Acetyl-CoA involves an oxidative decarboxylation. Correct the path of the electrons through this mechanism: Pyruvate -> NAD -> lipoamide -> FAD -> TPPIn TCA cycle, the enzyme that contains an FAD prosthetic group is— malate dehydrogenase. succinyl-CoA synthetase. succinate dehydrogenase. isocitrate dehydrogenase. fumarase.
- Each of the following citric acid cycle enzymes catalyzes electron transfer to NADH/FADH2 except A) isocitrate dehydrogenase. B) α-ketoglutarate dehydrogenase. C) succinyl CoA synthetase. D) succinate dehydrogenase. E) malate dehydrogenase.What is the rate-limiting step in the synthesis of acetyl CoA? oxidation regeneration of lipoamide decarboxylation transfer to lipoamide transfer to CoAHow many ATP may be produced from 1 mole of the following compounds on complete oxidation using the glycerol-3-phosphate shuttle? COMPOUNDSa.) Mannoseb.) Dihydroxyacetone phosphatec.) Citrated.) Malatee.) Succinate