MDCAT Biology MCQ #545

In the mitochondrial electron transport chain, why is FADH2 considered less energy-efficient than NADH during oxidative phosphorylation?

MDCAT Biology MCQ #545

  1. Question 1

    Q1. In the mitochondrial electron transport chain, why is FADH2 considered less energy-efficient than NADH during oxidative phosphorylation?

    • A) The number of electrons they carry to the ETC
    • B) The number of ATP molecules generated per molecule
    • C) The final electron acceptor they deliver electrons to
    • D) The ability to be oxidized by the respiratory chain

    Answer: The number of ATP molecules generated per molecule

    Explanation: NADH produces 3 ATP and FADH2 produces 2 ATP because FADH2 enters the ETC at a lower energy level.