The bacterial flagellum is driven to rotate by protons moving down a charge and pH gradient and the energy provided is called the proton motive force.
Proton motive force is the force which is provided by the movement of protons down their electrochemical gradient.
The proton motive force exists because of the difference in the concentration of protons across the membrane of the mitochondria.
The proton motive force is used by ATP synthase to synthesize ATP for cellular activities.
In conclusion, the proton motive force is used to synthesize ATP.
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