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

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

(a) nucleus

(b) ribosomes

(c) mitochondrion

(d) golgi complex

The question was posed to me during an online interview.

Enquiry is from Aerobic Respiration in portion Nucleus & Aerobic Respiration of Cell Biology

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The correct option is (c) mitochondrion

For explanation I would say: 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.

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