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MCAT Question A Day - 5/5/14 - Answer!

Glycolysis takes place in the cytoplasm of an animal cell. Which of the following is NOT a product or reactant in glycolysis?

A.  glucose
B.  pyruvate
C.  ATP
D.  O2

D is correct. ATP is a product. Two ATPs !'nter the reaction to "prime the pump", and four ATPs are produced. Glucose is a reactant and pyruvate is a product. Oxygen plays no role in glycolysis.