ATP synthesis in cell requiresA. `H^(+)` gradient across the membraneB. `K^(+)` gradient across the membraneC. `PO_(4)^(3-)` gradient across the membraneD. `Ca^(2+)` gradient across the membrane.

ATP synthesis in cell requiresA. `H^(+)` gradient across the membraneB

1.	ATP synthesis in cell requiresA. `H^(+)` gradient across the membraneB. `K^(+)` gradient across the membraneC. `PO_(4)^(3-)` gradient across the membraneD. `Ca^(2+)` gradient across the membrane.
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ATP synthesis in cell requiresA. `H^(+)` gradient across the membraneB. `K^(+)` gradient across the membraneC. `PO_(4)^(3-)` gradient across the membraneD. `Ca^(2+)` gradient across the membrane.

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