where does the phosphate come from in atp
In terms of its structure, ATP consists of an adenine attached by the 9-nitrogen atom to the 1 ′ carbon atom of a sugar (ribose), which in turn is attached at the 5 ′ carbon atom of the sugar to a triphosphate group. In its many reactions related to metabolism, the adenine and sugar groups remain unchanged, but the triphosphate is converted to di-and monophosphate, giving respectively the derivatives ADP and AMP. The three phosphoryl groups are referred to as the alpha (α), beta (β), and, for the terminal phosphate, gamma (γ).