Here's why:
* High-energy bonds: These bonds are called "high-energy" because they require a significant amount of energy to form and release a considerable amount of energy when broken.
* Repulsion: The negatively charged phosphate groups repel each other, creating a high amount of potential energy stored in the bond.
* Hydrolysis: When ATP is hydrolyzed (broken down), a water molecule is added, and the bond between the second and third phosphate groups is broken. This releases energy, which can be used by the cell to perform various tasks.
To sum it up, the energy stored in ATP is released when the bond between the last two phosphate groups is broken.
