The oxidation of which of the following will produce FADH₂?
Correct answer: D. Succinate
- A. Malate
- B. Fumarate
- C. FAD
- D. Succinate
Explanation
The correct answer is succinate. In the citric acid cycle, succinate is oxidized to fumarate by the enzyme succinate dehydrogenase. During this reaction, FAD is reduced to FADH₂, which is essential for the electron transport chain and ATP production. Malate is involved in a different step, converting to oxaloacetate and producing NADH instead. Fumarate is a product of succinate oxidation and does not directly produce FADH₂.. FAD is a coenzyme, not a substrate, and is reduced during succinate oxidation, not oxidized itself.
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Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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