Question Detail
Question
What ion is central to establishing the proton motive force in mitochondria?
Correct Answer
Option B is the correct answer.
Detailed Explanation
The proton motive force is an electrochemical gradient of hydrogen ions (H+, protons) across the inner mitochondrial membrane. It has two components: a chemical concentration difference (more H+ outside) and an electrical potential (more positive outside).
Hint
The entire chemiosmotic theory revolves around this ion.