The immediate energy source that drives atp synthesis by atp synthase during oxidative phosphorylation is the
a. oxidation of glucose and other organic compounds.
b. flow of electrons down the electron transport chain.
c. h+ concentration gradient across the membrane holding atp synthase.
d. transfer of phosphate to adp.

The correct answer is option c.

Explanation:

ATP synthase is an enzyme present in inner mitochondrial membrane which catalyses the formation of ATP.

It gets energy directly from chemiosmosis, that is, diffusion of protons from inter-membrane space into mitochondrial matrix through ATP synthase.

The flow of electrons down the electron transport chain help in building the proton concentration gradient across the inner mitochondrial membrane.

The proton then diffuse down the concentration gradient provides the ATP synthase with energy required for synthesis of ATP.

the correct option is option d