MDCAT Biology MCQ #541

Chemiosmosis occurs in both mitochondria and chloroplasts. What is the fundamental difference in the proton gradient's physical location between them?

MDCAT Biology MCQ #541

  1. Question 1

    Q1. Chemiosmosis occurs in both mitochondria and chloroplasts. What is the fundamental difference in the proton gradient's physical location between them?

    • A) The direction of ATP synthase rotation
    • B) The location of the high proton concentration
    • C) The use of an electron transport chain
    • D) The coupling of electron flow to proton pumping

    Answer: The location of the high proton concentration

    Explanation: In mitochondria, protons accumulate in the intermembrane space, while in chloroplasts, they accumulate inside the thylakoid lumen.