Dictionary of Human Evolution and Biology

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Double Helix

Linear structure of DNA; so-called because of its spiral conformation in quaternary structure. It consists of a double helix resembling a ladder that has been twisted into a spiral; the sides of the ladder consist of deoxyribose-phosphate units held together by the rung-like pairs of bases joined by hydrogen bonds. Aka DNA helix, twin helix, Watson-Crick helix.

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