What is ADP phosphorylation? What are photophosphorylation and oxidative phosphorylation?

Answer 1

Let's start by defining phosphorylation. Phosphorylation is the addition of a phosphate group into a molecule. In the case of ADP phosphorylation, the ending product will be ATP, ADP + P = ATP.

Phosphorylation is accomplished in three main ways: substrate-level, oxidative, and photophosphorylation.

Substrate-level phosphorylation is accomplished via enzymatic activity, ie ATP made in glycolysis.

Oxidative phosphorylation is accomplished via proton-motive force in the electron transport chain, taking advantage of the proton-gradient established by the electron transport chain, moving hydronium molecules through ATP synthase.

Photophosphorylation is accomplished via the proton pump central to photosystems I and II.