How does adenosiné triphosphate (ATP) become adenosine diphosphate (ADP)? ATP stores energy as a phosphate bond is formed. ATP releases energy as a phosphate bond is formed. ATP releases energy as a phosphate bond is broken. ATP stores energy as a phosphate bond is broken.

## Step 1<br />Adenosine triphosphate (ATP) is a molecule that carries energy within cells. It is composed of three phosphate groups, hence the name 'triphosphate'.<br /><br />## Step 2<br />When ATP is used by the cell, it releases energy. This happens when one of the phosphate groups is broken off, converting ATP into adenosine diphosphate (ADP), which has two phosphate groups.<br /><br />## Step 3<br />The breaking of the phosphate bond in ATP is an exothermic reaction, meaning it releases energy. This energy is then used by the cell to perform various functions.