Multiple choice

Cynide, a poison, works by acting on

  1. cytochrome

  2. alpha 1-antitrypsin

  3. NADH dehydrogenase

  4. monoamine oxidase
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A Correct answer
Explanation

Cyanide inhibits cytochrome c oxidase (Complex IV) in the mitochondrial electron transport chain, blocking cellular respiration. This prevents ATP production and leads to cellular asphyxiation. Alpha 1-antitrypsin is a protease inhibitor, NADH dehydrogenase is Complex I, and monoamine oxidase breaks down neurotransmitters.

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