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MCAT Question A Day - 8/9/13 - Answer!

Each pyruvic acid produced during glycolysis eventually leads to the production of how many molecules of carbon dioxide?

A.  2
B.  3
C.  4
D.  6

The correct answer is (B). Each pyruvic acid produces one carbon dioxide as it is converted to acetyl-CoA, and then two more carbon dioxides form as the acetyl-CoA is further broken down during the Krebs cycle. Although six carbon dioxide molecules result from the cellular respiration of glucose, the question refers to the number of carbon dioxides resulting from the breakdown of each pyruvic acid.