Exam 13: The Citric Acid Cycle

What are the fewest number of turns of the citric acid cycle needed before carbon radioactive in both carbons of the acetyl group in acetyl Co A are incorporated into all 4 carbons in every molecule of oxaloacetate produced?

Which of the following is not a fate of a citric acid cycle intermediate?

Pyruvate translocase is specific for transporting pyruvate across the inner mitochondrial membrane.

Each of the following catalyzed reactions of the citric acid cycle appears to be regulated except

Which cofactor is not used by the pyruvate dehydrogenase complex?

The carbon atoms that enter the citric acid cycle via acetyl CoA are the same ones released as carbon dioxide during one round of the citric acid cycle.

Why were muscle cells and extracts the best choice for Krebs,Johnson and Szent-Györgyi to elucidate the cyclic nature of the citric acid cycle?

Which carbon atom(s)of pyruvate is(are)first converted to carbon dioxide by pyruvate dehydrogenase complex?

The citric acid cycle oxidizes pyruvate,and some of the pathway intermediates are starting materials for many biosynthetic pathways.This means that the citric acid cycle is ________.

Aqueous channels in cell membranes that small molecules such as pyruvate can pass through are formed by transmembrane proteins called

Which of the following allosterically activates mammalian isocitrate dehydrogenase?

A metabolic pathway that is both catabolic and anabolic is ________.An example of such a pathway is ________.

Most bacteria do not have a complete citric acid cycle.

What is the role of mitochondrial PEPCK?

The pyruvate dehydrogenase complex is larger than a ribosome.In bacteria these complexes are located in the cytosol while they are found in ________ of eukaryotes

The net effect of the eight steps of the citric acid cycle is to

Please match the following reactions to their respective energy yielding products. Please note that a product may be used once,more than once,or not at all as an answer. -Succinate dehydrogenase complex

Which of the following inhibit(s)pyruvate dehydrogenase kinase?

NAD-dependent malate dehydrogenase

In aerobic prokaryotes,the succinate dehydrogenase complex is embedded in the inner mitochondrial membrane.