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Multiple Choice
In one turn of the citric acid cycle (per acetyl-CoA), how many molecules of are produced?
A
B
C
D
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Verified step by step guidance
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 specific step in the citric acid cycle where FAD is reduced to FADH2. This occurs during the conversion of succinate to fumarate, catalyzed by the enzyme succinate dehydrogenase.
Understand that for each turn of the cycle, only one molecule of FAD is reduced to FADH2, producing exactly one FADH2 molecule per acetyl-CoA.
Note that other electron carriers like NAD+ are reduced multiple times per cycle, but the question specifically asks about FADH2 production.
Conclude that the number of FADH2 molecules produced per turn of the citric acid cycle per acetyl-CoA is one.