Q.

During formation of ATP in chloroplast by chemiosmosis the part of the thylakoid which acts as proton pump is

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CF0

CF1

Cytochrome b6/f

Plastoquinone

answer is 3.

(Detailed Solution Below)

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Detailed Solution

Pump is protein involved in active movement of ions. In chemiosmosis, the pump is proton pump. In photosynthetic light reaction, Cytochrome b6/f complex acts as pump for the active movement protons from stroma to lumen by using the energy liberated from down hill movement of electrons. Plastoquinone is a benzoquinone and not a protein. CF0 is proton channel and CF1 is catalytic site for the formation of ATP from ADP and Pi.

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