DNA

Definition of DNA as it relates to Science, Genetics, Evolution

DNA, or deoxyribonucleic acid, is the hereditary material in humans and almost all other organisms. It is the molecule that carries most of the genetic instructions used in the development, functioning, and reproduction of all known living organisms and many viruses. DNA is a long polymer of nucleotides - small biomolecules composed of a phosphate group, a deoxyribose sugar, and a nitrogenous base - which are usually symbolized by the letters A, C, G, and T. DNA molecules are double-stranded helices. The double helix is twisted into a right-handed spiral. It is this structure that encodes genetic information in sequences of nucleotides called genes. As a fundamental component of genetics, DNA plays an integral role in the study of evolution as well.

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