ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
DNA helix. Computer artwork of part of a molecule of DNA (deoxyribonucleic acid). The DNA molecule has a double helix structure. The two helical strands are composed of a sugar-phosphate polymer. These strands are held together by pairs of nucleotide bases. The sequence of bases encodes genetic information, which directs the synthesis of proteins.
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