ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
DNA double helix. Computer artwork of a double- stranded DNA (deoxyribonucleic acid) helix. Each strand is composed of a sequence of nucleotide units. Interactions between the sugar-phosphate groups of each nucleotide form the spiralling backbones of the helix. The strands are linked together by complementary pairing between the variable base group of each nucleotide. The sequence of the base groups (adenine, cytosine, guanine, thymine) along the DNA helix is known as the genetic code. It carries the instructions necessary for the development and function of all living organisms.
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