The generation of ATP is crucial for organic life, as it acts as a currency for various reactions. When an organism wants to do some form of work, such as move muscles, it uses sucrose to perform the task, but ATP is used in the formation of sucrose. Energy is stored in the phosphate bonds of the molecule using a covalent bond. Organic cells break the bond, releasing energy and turning the ATP to ADP (adenosine diphosphate). Mitochondria in cells then reattach a phosphate unit to the molecule, effectively recycling the ATP.
Hope this helps!>