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In the presence of oxygen, the three-carbon compound pyruvate can be catabolized in the citric acid cycle. First, however, the pyruvate 1) loses a carbon, which is given off as a molecule of CO 2 , 2) is oxidized to form a two-carbon compound called acetate, and 3) is bonded to coenzyme A.
-How many carbon atoms are fed into the citric acid cycle as a result of the oxidation of one molecule of pyruvate?
A)2
B)4
C)6
D)8
E)10

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Quizplus · Accepted Answer

One molecule of pyruvate, which is a three-carbon compound, loses one carbon as CO2 and forms a two-carbon compound called acetate. This acetate, bonded to coenzyme A, enters the citric acid cycle, contributing two carbon atoms.

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