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Answer: 2. Succinic dehydrogenase

Key idea: Malonate (written "melonate" in the question) is a competitive inhibitor of succinic dehydrogenase, an enzyme of the TCA cycle, because it resembles the substrate succinate.

Blocking this enzyme stops respiration and the bacteria cannot grow. Option 2.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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