What is the name of the flow of hydrogen ions through the protein channel of the thylakoid membrane?
APhotorespiration
BCarbon fixation
CTranspiration
DChemiosmosis
Answer & Solution
Correct answer: D. Chemiosmosis
1. Hydrogen ions rush through an opening in the thylakoid membrane, much like water through a hole in a dam.
2. That opening is a passage through a specialised protein channel called ATP synthase.
3. The flow of hydrogen ions through it is called chemiosmosis.
4. The name fits because the ions move from high to low concentration through a semi-permeable structure.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 8 "Photosynthesis", section 8.2 The Light-Dependent Reactions of Photosynthesis_
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