When the organism is resting and energy is not immediately needed, the reverse reaction takes place and the phosphate group is reattached to the molecule using energy obtained from food or sunlight.

ATP consists of an adenosine base (blue), a ribose sugar (pink) and a phosphate chain. The high-energy phosphate bond in this phosphate chain is the key to ATP's energy storage potential. Cells ...

ATP (adenosine triphosphate) is the energy-carrying molecule used in cells because it can release energy very quickly. Energy is released from ATP when the end phosphate is removed. Once ATP has ...

This image illustrates the chemical structure of a purine molecule, highlighting the numbering of the carbon and nitrogen atoms ... Adenine is also a component of important biomolecules such as ATP ...