How does an ATP molecule supply a cell with energy to do work?
As a nutrient (for example, glucose) is catabolized, the energy created is stored in ATP molecules. ATP stores this energy in the bonds between its phosphate groups. When these bonds are broken, that energy is released from the ATP molecule. To use the energy stored in ATP, enzymes must move the terminal phosphate group to another molecule. The receiving molecule is then called phosphorylated and temporarily has energy to do some work. During this process the ATP molecule loses a phosphate group and becomes ADP. Another phosphate group can be used, resulting in the creation of a molecule of AMP. As more glucose and other nutrients are metabolized, phosphate groups are joined to AMP creating a renewed source of ATP.