The energy for ATP synthesis in chemiosmotic phosphorylation comes from the movement of hydrogen ions across a membrane down a concentration gradient.

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This is correct. The movement of hydrogen ions (protons) across a membrane down their concentration gradient releases energy that can be used to synthesize ATP by the enzyme ATP synthase. This process is called chemiosmotic phosphorylation and occurs in the electron transport chain during cellular respiration or in the thylakoid membrane during photosynthesis.

The Energy for ATP Synthesis in Chemiosmotic Phosphorylation Comes from the Movement