AP BIOLOGY

CELL RESPIRATION

THE KREBS CYCLE

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

During the intermediate process of cellular respiration, the oxidation of pyruvate, which of the following does NOT occur?

A	NAD+ is reduced
B	An electron donor is produced (NADH)
C	Carbon dioxide is produced
D	A 3-carbon molecule of Acetyl CoA is produced

Explanation:

Detailed explanation-1: -Overview of pyruvate oxidation Pyruvate-three carbons-is converted to acetyl CoA, a two-carbon molecule attached to coenzyme A. A molecule of coenzyme A is a necessary reactant for this reaction, which releases a molecule of carbon dioxide and reduces a NAD+ to NADH.

Detailed explanation-2: -Answer and Explanation: Pyruvate oxidation produces acetyl Coenzyme A, NADH, and carbon dioxide.

Detailed explanation-3: -Pyruvate oxidation. Pyruvate travels into the mitochondrial matrix and is converted to a two-carbon molecule bound to coenzyme A, called acetyl CoA. Carbon dioxide is released and NADH is made.

Detailed explanation-4: -After pyruvate is produced from glycolysis, it enters the mitochondria to begin aerobic respiration. Aerobic respiration begins with the conversion of pyruvate to acetyl CoA. This conversion takes place in three steps: decarboxylation, the reduction of NAD+, and the attachment of coenzyme A.

There is 1 question to complete.