Adenine molecule and phosphate group. Molecular model of adenine (right), one of four nucleotide bases found in DNA (deoxyribonucleic acid), and a phosphate group (left). Atoms (spheres) are colour-coded: carbon (yellow), nitrogen (green), hydrogen (white), oxygen (pink, small) and phosphorus (red, large). In the DNA molecule, adenine bonds with thymine, holding the double helix together. Phosphate-sugar groups form the backbone of the helical strands. It is the sequence of the bases along a DNA strand that encodes the genetic information that is the basis of all life on Earth.
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