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Mechanism of Cyanide

The lethal poison cyanide causes death by interfering with cellular respiration. What is cyanide’s mechanism of toxicity?

A. Cyanide blocks the passage of electrons from cytochrome oxidase a3 to oxygen.

B. Cyanide inhibits the binding of ATP to ATP synthase.

C. Cyanide covalently binds to coenzyme Q (ubiquinone).

D. Cyanide breaks down the proton gradient across the inner mitochondrial membrane.

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