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Proton motive force is the net sum of how many gradient components?

(a) 1

(b) 2

(c) 3

(d) 4

I had been asked this question by my school teacher while I was bunking the class.

This question is from Aerobic Respiration topic in section Nucleus & Aerobic Respiration of Cell Biology

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Right option is (b) 2

Easiest explanation: Proton motive force is a measure of electrochemical gradient. Because the translocation of protons across the membrane lead to a difference of hydrogen ion concentration and a difference of charge, the energy present in both components of the proton electrochemical gradient are combined and expressed as proton motive force.

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