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Both chains are coiled round the same axis, and have the same pitch of 34 ångströms (3.4 nanometres).

The complementary nitrogenous bases are divided into two groups, pyrimidines and purines.

DNA) is a molecule that carries the genetic instructions used in the growth, development, functioning and reproduction of all known living organisms and many viruses.

DNA and ribonucleic acid (RNA) are nucleic acids; alongside proteins, lipids and complex carbohydrates (polysaccharides), they are one of the four major types of macromolecules that are essential for all known forms of life.

RNA strands are created using DNA strands as a template in a process called transcription.

Under the genetic code, these RNA strands are translated to specify the sequence of amino acids within proteins in a process called translation.

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