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The flow of hydrogen ions through ATP synthase from the thylakoid lumen to the stroma is called:

APhotolysis
BGlycolysis
CHydrolysis
DChemiosmosis
Answer & Solution
Correct answer: D. Chemiosmosis
1. Protons pile up in the lumen. 2. Their rush through ATP synthase is chemiosmosis. 3. ATP synthase adds a phosphate to ADP. _Source: OpenStax Biology 2e, Chapter 8, Photosynthesis (CC BY 4.0)._
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