DNA molecules

DNA molecules

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Credit: RUSSELL KIGHTLEY/SCIENCE PHOTO LIBRARY

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Caption: DNA molecules. Computer artwork of the structure of deoxyribonucleic acid (DNA). DNA is composed of two strands of sugar (yellow) and phosphate (red). These 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, orange), and cytosine (C) and thymine (T) (pyrimidines, green). The bases link together in the centre of the double helix using hydrogen bonds (not seen). T always links with A, and C always links with G. DNA contains an organism's genetic information.

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