KEVIN CURTIS / SCIENCE PHOTO LIBRARY KEVIN CURTIS / SCIENCE PHOTO LIBRARY
DNA analysis, negative image. Petri dish with the letters DNA, test tubes and eppendorf tubes containing samples of DNA (deoxyribonucleic acid) on graphs showing the results of DNA sequencing. A DNA molecule consists of two sugar-phosphate backbones, arranged as a double helix, joined by nucleotide bases. There are 4 types of nucleotide base; adenine (A), cytosine (C), guanine (G) and thymine (T). Sequences of these bases make up genes, which encode an organism's genetic information. Uses of DNA sequencing include; finding genes responsible for disease, DNA fingerprinting and finding the function of genes.
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