Paired DNA strands | HHMI's BioInteractive - 1 views
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Lottie Peppers on 28 Sep 14DNA has a double helix structure. If untwisted, DNA looks like two parallel strands. Each strand has a linear sequence of A, C, G, and T. The precise order of the letters carries the coded instructions. One strand is a complementary image of the other: A always pairs with T, and C always pairs with G.