Adenine (A) is one of four chemical bases
, with the other three being cytosine
(G), and thymine
(T). Within the DNA molecule
, adenine bases located on one strand form chemical bonds with thymine bases on the opposite strand. The sequence of four DNA bases encodes the cell
's genetic instructions. A form of adenine called adenosine triphosphate (ATP) serves as an energy storage molecule and is used to power many chemical reactions within the cell.