Question

Which of these are respiratory poisons or inhibitors of ETC?

• A. Cyanides
• B. Antimycin A
• C. Carbon monoxide
• D. All of these

Answer 1

Answer: (D)

All of these

Site-specific inhibitors of electron transport prevent the passage of electrons by binding to a component of the chain, blocking the Oxidation/reduction reaction.

Antimycin A, an antibiotic, blocks electron transport at the level of the ${CoQH}_2$-cytochrome c-reductase (Complex III). Cyanide, azide, and Co bind with cytochrome oxidase complex and inhibit the terminal transfer of electrons to oxygen.

So the correct answer is 'All of these'.