Citric acid cycle products per acetyl-CoA
One turn of the citric acid cycle, starting from one acetyl-CoA, produces:
Answer B: explanation for every choice
A
Only one FADH2 forms per turn, at succinate dehydrogenase.
B
Correct. NADH comes from isocitrate dehydrogenase, α-ketoglutarate dehydrogenase, and malate dehydrogenase. Succinate dehydrogenase makes FADH2.
C
The third CO2 comes from pyruvate dehydrogenase, which is not part of the cycle.
D
Four NADH counts the one made by pyruvate dehydrogenase. The cycle makes one GTP (or ATP), not two.
TakeawayPer acetyl-CoA: 3 NADH, 1 FADH2, 1 GTP, 2 CO2. Double these for one glucose.
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Reviewed 2026-11-05 by a medical student. Spot an error? Report it with question ID bb64.