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A competitive inhibitor of succinic dehydrogenase is

1. Malonate
2. Oxaloacetate
3. α-ketoglutarate
4. Malate

Correct answer: Malonate

Solution

Malonate is a structural analog of succinate, so it competes for the active site of succinate dehydrogenase. Because it binds competitively, it inhibits the enzyme without being converted to product.

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