MDCAT Biology MCQ #509

During the electron transport chain, electrons are passed through a series of cytochromes. What is the correct sequence of these carriers?

MDCAT Biology MCQ #509

  1. Question 1

    Q1. During the electron transport chain, electrons are passed through a series of cytochromes. What is the correct sequence of these carriers?

    • A) Cyt b -> Cyt a -> Cyt c -> Cyt a3
    • B) Cyt a -> Cyt b -> Cyt c -> Cyt a3
    • C) Cyt b -> Cyt c -> Cyt a -> Cyt a3
    • D) Cyt c -> Cyt b -> Cyt a -> Cyt a3

    Answer: Cyt b -> Cyt c -> Cyt a -> Cyt a3

    Explanation: The sequence is CoQ -> Cyt b -> Cyt c -> Cyt a -> Cyt a3. Cytochrome a3 is the final complex before oxygen.