DNA encodes information, and despite the splendiferous diversity of life, the universal ?alphabet? that DNA uses to jot information down consists of just four letters?A, C, G, and T. (This quartet is also known as the DNA bases, or, individually, as adenine, cytosine, guanine, and thymine.) The bases bind together inside the famous DNA double helix, and they bind together in a particular way. If A appears on one of the helix?s two strands, T must appear opposite it on the other strand (and vice-versa), because A and T molecules fit each other like puzzle pieces. Similarly, if C or G appears on one helix strand, the other letter must appear opposite. (To remember the pairings, notice that angular A and T bond, as do curvaceous C and G.) Because of this complementary A-T and C-G base-pairing, one strand of DNA can serve as a template for copying the other. If one side reads CCGAGT, the other side must read GGCTCA.
Source: http://feeds.slate.com/click.phdo?i=0f08918995b10fc1b4c3430afbc18385
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