MDCAT Biology MCQ #489

In the mitochondrial electron transport chain, FADH2 donates its electrons to a specific complex. Which complex is the first recipient for these electrons?

MDCAT Biology MCQ #489

  1. Question 1

    Q1. In the mitochondrial electron transport chain, FADH2 donates its electrons to a specific complex. Which complex is the first recipient for these electrons?

    • A) NADH dehydrogenase (Complex I)
    • B) Succinate dehydrogenase (Complex II)
    • C) Cytochrome bc1 (Complex III)
    • D) Cytochrome oxidase (Complex IV)

    Answer: Succinate dehydrogenase (Complex II)

    Explanation: FADH2 enters at Complex II, bypassing the first proton pump; NADH enters at Complex I, yielding more ATP.