Editing Phosphorylation (section)

== During respiration ==
Phosphorylation is essential to the processes of both [[Anaerobic respiration|anaerobic]] and [[aerobic respiration]], which involve the production of [[adenosine triphosphate]] (ATP), the "high-energy" exchange medium in the cell. During aerobic respiration, ATP is synthesized in the [[mitochondrion]] by addition of a third phosphate group to [[adenosine diphosphate]] (ADP) in a process referred to as [[oxidative phosphorylation]]. ATP is also synthesized by [[substrate-level phosphorylation]] during [[glycolysis]]. ATP is synthesized at the expense of solar energy by [[photophosphorylation]] in the [[chloroplast]]s of plant cells.