MDCAT Biology MCQ #281

A forensic report indicates a victim died of cyanide poisoning, which blocks the final electron carrier. Which molecule is specifically inhibited?

MDCAT Biology MCQ #281

  1. Question 1

    Q1. A forensic report indicates a victim died of cyanide poisoning, which blocks the final electron carrier. Which molecule is specifically inhibited?

    • A) NADH dehydrogenase
    • B) Cytochrome b
    • C) Cytochrome c
    • D) Cytochrome oxidase

    Answer: Cytochrome oxidase

    Explanation: Cyanide inhibits cytochrome a3, stopping the ETC; NADH dehydrogenase is tempting but it acts at the start of the chain.