Question 8Pyruvate dehydrogenase catalyzes the conversion of pyruvate to acetyl CoA. In thisreaction, one molecule each of the catalytic coenzymes TPP, FAD and lipoamideparticipate in the reaction but are not consumed.TrueFalseDIES<< Previous3 ptve Last checked at 10:08pmNext

The process of converting pyruvate, a crucial metabolite derived from glycolysis, into acetyl CoA…

Answered: Pyruvate dehydrogenase catalyzes the…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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During Krebs cycle, the conversion of isocitrate to alpha-keto glutarate involves all of the following reactions/mechanisms except Reduction of isocitrate Reduction of NAD+ Decarboxylation of isocitrate Oxidation of isocitrate
Show a balanced equation for the synthesis of glucose from acetyl-CoA via the glyoxylate cycle
Which of the following describe a role of lipoic acid in the pyruvate dehydrogenase complex of the citric acid cycle? (Select all that apply.) It accepts a hydroxyethyl group from pyruvate. O It reduces coenzyme A. O It transfers an acetyl group to coenzyme A. It is a reducing agent.
In the first step of the TCA cycle the acetyl group of acetyl-CoA is transferred to oxaloacetate to produce citrate. Where will the carbonyl carbon of that acetyl group be after the first CO2 is expelled? Group of answer choices The first carbon of α-ketoglutarate The last carbon of α-ketoglutarate The fourth carbon of α-ketoglutarate The third carbon of α-ketoglutarate
There are two steps in the TCA cycle that involve the release of free CoA-SH. However, only one of these steps is regulated (i.e. only one of the steps has a large negative delta G). Explain why one of these CoA-SH releasing steps is highly thermodynamically favorable while the other is not.
Which citric acid cycle enzyme utilizes a similar reaction mechanism to pyruvate dehydrogenase? O Malate dehydrogenase Isocitrate dehydrogenase O Alpha-ketoglutarate dehydrogenase Succinate dehydrogenase
Each of the following enzymes are similar in that they are all regulation points for the pathway/cycle they operate in ... except for one enzyme. Which of the following is not a regulated enzyme? Pyruvate carboxylase Transketolase Glycogen phosphorylase Citrate Synthase Phosphofructokinase Acetyl CoA carboxylase 888888
Discuss the metabolic control for HMG CoA reductase synthesis and activity
The first step of gluconeogenesis involves the carboxylation of pyruvate and has a large negative delta G (i.e very exergonic). Explain how it is possible that this step can be exergonic if we know that adding CO2 onto molecules is fundamentally a destabilizing phenomenon?
L What is the difference between the type of oxidation catalyzed by acyl-CoA dehydrogenase and that catalyzed by b-hydroxyCoA dehydrogenase
alpha-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
The same reactions that were seen in the process of converting pyruvate to acetyl-S-CoA, occur in step ____ of the citric acid cycle as ____________ is converted to _________________.

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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. True O False