MDCAT Biology MCQ #162

A laboratory technician accidentally ingests a chemical that binds to the iron atom in cytochrome c oxidase. Which process is directly halted first?

MDCAT Biology MCQ #162

  1. Question 1

    Q1. A laboratory technician accidentally ingests a chemical that binds to the iron atom in cytochrome c oxidase. Which process is directly halted first?

    • A) Glycolysis
    • B) Krebs cycle
    • C) Electron transport chain
    • D) Pyruvate oxidation

    Answer: Electron transport chain

    Explanation: Cyanide poisons cytochrome oxidase in the ETC; Krebs cycle stops because it lacks regenerated NAD+ and FAD from the blocked chain.