2. How is ADP different from ATP? A ADP has one less phosphate group and can store more energy. B ADP has one more phosphate group and can store more energy. C ADP has one more phosphate group and stores less energy. D ADP has one less phosphate group and stores less energy.

## Step 1<br />ADP (Adenosine Diphosphate) and ATP (Adenosine Triphosphate) are both important molecules in cellular metabolism. They play a crucial role in the storage and release of energy within cells.<br /><br />## Step 2<br />The primary difference between ADP and ATP is the number of phosphate groups they contain. ATP is a high-energy molecule with three phosphate groups, while ADP has only two phosphate groups.<br /><br />## Step 3<br />The energy stored in ATP is released when one of its phosphate groups is removed into ADP. This process is known as hydrolysis.<br /><br />## Step 4<br />The removal of a phosphate group from ATP to form ADP results in the release of energy. This is because the energy is stored in the bonds between the phosphate groups, and breaking these bonds releases the stored energy.<br /><br />## Step 5<br />Therefore, ADP, with one less phosphate group, stores less energy than ATP.