MCQ
Energy required for ATP synthesis in PSII comes from:
- AProton gradient.
- BElectron gradient.
- CReduction of glucose.
- DXidation of glucose.
✓
Answer
- Proton gradient.
Explanation:
PhotosystemII (PSII) is a photosynthetic pigment system along with some electron carriers that is located in the appressed part of the grana thylakoids. PSII has chlorophyll a, chlorophyll b and carotenoids. It picks up electron released during photolysis of water. The same is extruded on absorption of light energy. As the extruded electron passes over cytochrome b6-f complex, it energises passage of protons picked up by PQ to create proton gradient for synthesis of ATP from ADP and inorganic phosphate. This photophosphorylation is noncyclic.
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