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Multiple Choice
Which of the following is NOT produced directly during one turn of the citric acid (Krebs) cycle per acetyl-CoA oxidized?
A
B
C
D
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1
Recall the main products generated directly in one turn of the citric acid (Krebs) cycle per acetyl-CoA molecule oxidized. These typically include reduced electron carriers and a high-energy molecule.
Identify the reduced electron carriers produced: one molecule of FADH2 and three molecules of NADH are generated directly in the cycle.
Note that one molecule of GTP (or ATP, depending on the cell type) is also produced directly by substrate-level phosphorylation during the cycle.
Understand that molecular oxygen (O2) is not produced by the citric acid cycle itself; instead, it acts as the final electron acceptor in the electron transport chain, which is a separate process.
Therefore, the molecule NOT produced directly during one turn of the citric acid cycle per acetyl-CoA oxidized is O2, while FADH2, NADH, and CO2 are direct products.