MDCAT Biology MCQ #442

When comparing chemiosmosis in mitochondria and chloroplasts, which description correctly identifies the location of the high proton concentration in mitochondria?

MDCAT Biology MCQ #442

  1. Question 1

    Q1. When comparing chemiosmosis in mitochondria and chloroplasts, which description correctly identifies the location of the high proton concentration in mitochondria?

    • A) Protons are pumped from the stroma to the thylakoid lumen
    • B) ATP synthase is embedded in the inner mitochondrial membrane
    • C) Protons flow down their gradient through the CF1 particle
    • D) The reservoir of high proton concentration is the intermembrane space

    Answer: The reservoir of high proton concentration is the intermembrane space

    Explanation: In chloroplasts, protons are pumped into the thylakoid lumen, whereas in mitochondria, they are pumped into the intermembrane space.