The left side of the diagram is adenine, the middle part is ribose which is a sugar.
A sugar molecule is composed of 12 carbon, 22 hydrogen, and 11 oxygen atoms that is made the structure of the sugar.
In ATP molecules, energy is stored in the covalent bonds that is present between phosphates. The greatest amount of energy is present in the bond between the second and third phosphate groups.
ADP is converted to ATP by the addition of a high-energy phosphate group to ADP making it ATP.
ATP has more potential energy than ADP. ATP has three negatively charged phosphates whereas ADP has two phosphates.
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