CHRIS KNAPTON / SCIENCE PHOTO LIBRARY CHRIS KNAPTON / SCIENCE PHOTO LIBRARY
DNA molecule. Model of part of a strand of DNA (deoxyribonucleic acid). DNA contains all the inherited instructions necessary for the development and functioning of living organisms. The DNA molecule is composed of two spiral strands of sugar phosphates joined by pairs of cross- linking nucleotide bases (linked balls). The sequence of these bases makes up the unique genetic code of each organism.
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