CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY
DNA with money. Computer artwork of a DNA double helix superimposed over a British 20 pound note. This image could represent the commercial implications of DNA research. A molecule of DNA (deoxyribonucleic acid) consists of two helical chains coiled around the same axis, each chain consisting of alternate phosphate and sugar groups. The chains are held together in a double helix by the hydrogen bonds formed between nucleotide bases attached to the two chains. There are four bases; adenine (A), cytosine (C), guanine (G) and thymine (T). The sequence of the bases in the molecule forms the genetic code.
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