Cоmpаre substrаte-level phоsphоrylаtion, oxidative phosphorylation, and photophosphorylation. For each type of phosphorylation, describe: The energy source that drives ATP formation. Where it occurs in a microbial cell. Why oxidative phosphorylation typically yields the most ATP per molecule of glucose. How electron flow is linked to the proton motive force and ATP synthase.