Define photophosphorylation.
GeneralClass 12AllAnswered 27 Mar 2026
Answer
Photophosphorylation is the light-dependent synthesis of ATP from ADP and inorganic phosphate (Pi) in the chloroplast thylakoid membranes. This process occurs via chemiosmosis, where light energy creates a proton gradient that drives ATP synthase enzyme activity.
Two types exist:
- Non-cyclic photophosphorylation (produces ATP + NADPH + O₂)
- Cyclic photophosphorylation (produces only ATP)
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