MDCAT Biology MCQ #196

Where does the highest concentration of protons build up during the operation of the mitochondrial electron transport chain?

MDCAT Biology MCQ #196

  1. Question 1

    Q1. Where does the highest concentration of protons build up during the operation of the mitochondrial electron transport chain?

    • A) Mitochondrial matrix
    • B) Cytoplasm
    • C) Stroma
    • D) Intermembrane space

    Answer: Intermembrane space

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