Question

1. a molecule of atp has phosphate groups attached to it. when the cell needs energy, it converts atp into. when the cell is able to store energy, it converts to.

Explanation:

ATP (adenosine - tri - phosphate) has 3 phosphate groups. When the cell needs energy, ATP is hydrolyzed to ADP (adenosine - di - phosphate) and a phosphate group, releasing energy. When the cell can store energy, ADP can combine with a phosphate group to form ATP again.

Answer:

1. 3
2. ADP and a phosphate group
3. ADP
4. ATP