DNA molecule

DNA molecule

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This image is part of the feature Science Photo Library - September Monthly Focus

Credit: RUSSELL KIGHTLEY/SCIENCE PHOTO LIBRARY

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Caption: DNA molecule. Computer artwork of the structure of deoxyribonucleic acid (DNA). DNA is composed of sugar (pink), phosphate (blue), oxygen (purple), hydrogen (white), nitrogen (green) and nucleotide bases (orange and purple). The sugar and phosphate form two strands, which twist to form a double helix. Each sugar has a nucleotide base attached to it. There are four bases: guanine (G) and adenine (A) (purines, purple), and cytosine (C) and thymine (T) (pyrimidines, orange). The bases link together in the centre of the double helix using hydrogen bonds (grey lines). T always links with A, and C always links with G. DNA contains an organism's genetic information.

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