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 CO2 2) is oxidized to form a two-carbon compound called acetate, and 3) is bonded to coenzyme A. Why is coenzyme A, a sulfur containing molecule derived from a B vitamin, added?

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 CO2 2) is oxidized to form a two-carbon compound called acetate, and 3) is bonded to coenzyme A. Why is coenzyme A, a sulfur containing molecule derived from a B vitamin, added?

Naim 11:59

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 CO2 2) is oxidized to form a two-carbon compound called acetate, and 3) is bonded to coenzyme A.
Why is coenzyme A, a sulfur containing molecule derived from a B vitamin, added?



A. Because sulfur is needed for the molecule to enter the mitochondrion
B. In order to utilize this portion of B vitamin which would otherwise be a waste product from another pathway
C. To provide a relatively unstable molecule whose acetyl portion can readily bond to oxaloacetate
D. Because it drives the reaction that regenerates NAD+







Answer: C


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