The specific energy source for the reaction ADP + phosphate \rightarrow ATP by the enzyme ATP synthetase (CF1 Coupling Factor) in thylakoid…
The specific energy source for the reactionby the enzyme ATP synthetase (CF1 Coupling Factor) in thylakoid membranes is
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Correct Answer: Option C
Explanation
During light reactions (photophosphorylation) in plant thylakoids: The electron transport chain (Photosystem II → plastoquinone → Cyt→ plastocyanin → Photosystem I → ferredoxin → NADPreductase) pumpsinto the thylakoid LUMEN, creating a proton-motive force (pmf):. The lumen pH drops to ~5 while stroma remains ~8 — apH of ~3. Hflows from lumen (high concentration) back to stroma (low concentration) through-ATP synthase (coupling factor 1), driving the rotary F-type ATP synthase mechanism:. This is photophosphorylation. Oxidation of water releasesandbut is a consequence, not the direct energy source for ATP synthase.