ATP
(adenosine triphosphate) is the universal energy currency of a cell. Its secret
lies in its structure. ATP contains three negatively charged phosphate groups.
When the bond between the outermost two phosphate groups is broken, ATP becomes
ADP (adenosine diphosphate). This reaction releases 7.3 kilocalories/mole of
ATP, which is a great deal of energy by cell standards.
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