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Question

ATP synthesis in cell requires

A
H+ gradient across the membrane
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B
K+ gradient across the membrane
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C
PO34 gradient across the membrane
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D
Ca2+ gradient across the membrane
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Solution

The correct option is A H+ gradient across the membrane
A) A H+ gradient or proton pump is developed in the lumen of the thylakoid which helps in ATP synthesis.
B) K+ does not play a role in ATP synthesis.
C) PO34 does not play a role in ATP synthesis.
D) Ca2+ is involved in the photolysis of water.
So the correct answer is 'H+ gradient across the membrane'.

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