In the initial stages of photosynthesis, a process known as photophosphorylation uses solar energy to convert ADP to ATP.
ADP will include two phosphate groups (thus the diphosphate), whereas ATP will still contain all three phosphates. This is the primary structural difference between adenosine diphosphate (ADP) and adenosine triphosphate (ATP) (hence the triphosphate). When ATP's one phosphate group is hydrolyzed, ADP is produced.
The phosphate group, which has available electrons, transfers electrons during the conversion of ATP to ADP. An oxidation reaction occurs when a phosphate group in ATP is removed; this process also removes electrons.
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