[Campbell Biology P.224] According to the text, what is the direct power source that drives ... | Practice Question

According to the text, what is the direct power source that drives ATP synthesis by ATP synthase?

  • A: Hydrolysis of ATP.
  • B: The movement of electrons along the electron transport chain.
  • C: A difference in the concentration of H+ (a pH difference) across the inner mitochondrial membrane.
  • D: The direct transfer of phosphate from a substrate molecule.

Explanation

The text explicitly states: 'The power source for ATP synthase is a difference in the concentration of H+ a pH difference on opposite sides of the inner mitochondrial membrane.' This process is called chemiosmosis.