DNA. Computer representation of deoxyribonucleic acid (DNA). This structure contains the inherited instructions necessary for the development of living organisms. A DNA molecule is composed of two interwound strands twisted into a helical shape which gives it great stability. Each strand alternates a sugar group (red-yellow) with a phosphate group (grey). The two strands are linked by pairs of substances called bases (blue) of which there are four types known as adenine,guanine,thymine and cytosine. Each pair of bases is linked by hydrogen bonds | |
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