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TCA Cycle

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ANSWER: A. 24 

Under the TCA cycle, 2 ATP are produced under substrate-level phosphorylation, 18 ATP are produced under oxidative phosphorylation (with 6 NADH) and 4 ATP are produced from oxidative phosphorylation (with 2 FADH2), adding up to a total of 24 ATP produced in the TCA cycle.