For which organelle proton motive force is also a source of energy?

For which organelle proton motive force is also a source of energy? Correct Answer mitochondrion

Other than hydrolysis of ATP, mitochondrion has alternate sources of energy one of which is proton motive force. It drives the uptake of ADP in exchange of ATP; and can also be used to pull calcium ions into the mitochondrion.
Bissoy MCQ

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