The TCA cycle begins when ________.
A. pyruvate from the glycolytic pathway is oxidized to acetyl-CoA, which is added to oxaloacetate
B. NADH is oxidized to NAD+, which provides a source of electrons to drive the cycle
C. pyruvate from the glycolytic pathway is added to oxaloacetate
D. ATP from the glycolytic pathway is hydrolyzed, providing the energy to start the cycle
Answer: A
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