GUNILLA ELAM / SCIENCE PHOTO LIBRARY GUNILLA ELAM / SCIENCE PHOTO LIBRARY
DNA molecule. Computer artwork showing a double stranded DNA (deoxyribonucleic acid) molecule. DNA is composed of two strands twisted into a double helix. Each strand consists of a sugar-phosphate backbone (blue ribbons) attached to nucleotide bases (coloured bars). There are four bases: adenine: A, cytosine: C, guanine: G and thymine: T. The bases are joined together by hydrogen bonds (not shown). DNA contains sections called genes that encode the body's genetic information.
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