Since ATP and ADP are molecules, the bond that is broken between the last phosphates is a bond.

Phosphoanhydride bond

Explanation:

ATP (Adenosine triphosphate) and ADP (Adenosine diphosphate) are two molecules involved in the storage and release of energy in the cells of living organisms. The structures of these molecules allow them fulfil their energy-related function.

Energy is stored when one phosphate group is added to ADP to form ATP, while the energy is released when the last phosphate group of the three phosphate groups in the ATP molecule gets removed. However, to remove this last phosphate group, a bond that holds one phosphate to another in the ATP molecule called PHOSPHOANHYDRIDE BOND must be broken. Therefore, the bond that is broken between the last phosphates is a PHOSPHOANHYDRIDE bond.

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