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Gif. Deoxyribonucleic acid is a molecule composed of two polynucleotide chains that coil around each other to form a double helix carrying genetic instructions for the development, functioning. It is made of repeated blocks (polymers) called nucleotides, which together form the shape of a double helix.
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Dna stands for deoxyribonucleic acid. These instructions are found inside every cell, and are passed down. Free biology revision notes on dna structure. Deoxyribonucleic acid (dna) is a nucleic acid that contains the genetic instructions used in the development and functioning of all known living organisms and some viruses.