In one turn of the citric acid (Krebs) cycle per acetyl-CoA, how many molecules of are produced?
A
B
C
D
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1
Recall that the citric acid cycle (Krebs cycle) processes one acetyl-CoA molecule per turn, generating several reduced coenzymes that carry electrons to the electron transport chain.
Identify the key reduced coenzymes produced in one turn: NADH, FADH2, and GTP (or ATP). Specifically, focus on FADH2, which is produced at a specific step in the cycle.
Locate the step in the cycle where FAD is reduced to FADH2. This occurs during the conversion of succinate to fumarate, catalyzed by the enzyme succinate dehydrogenase.
Understand that this step produces exactly one molecule of FADH2 per acetyl-CoA oxidized in the cycle.
Conclude that for each turn of the citric acid cycle per acetyl-CoA, one molecule of FADH2 is produced.