DNA double helix

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Computer representation of deoxyribonucleic acid (DNA). This is the structure which contains the inherited coded instructions responsible for the development of an organism. A DNA molecule is composed of two interwound strands (blue) twisted into a helical shape which gives it great stability. Each strand alternates a sugar group with a phosphate group. The two strands are linked by pairs of substances called bases, of which there are four types known as adenine and guanine (yellow), thymine and cytosine (red). Cytosine is always linked to guanine whereas adenine is linked to thymine. The linkage between the bases is formed by hydrogen bonds (blue dashes).

Credit: Will & Deni McIntyre / Science Source

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