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Card 10 / 79:
BASE PAIR
Two bases which form a "rung of the DNA ladder." A DNA nucleotide is made of a molecule of sugar, a molecule of phosphoric acid, and a molecule called a base. The bases are the "letters" that spell out the genetic code. In DNA, the code letters are A, T, G, and C, which stand for the chemicals adenine , thymine , guanine , and cytosine , respectively. In base pairing, adenine always pairs with thymine, and guanine always pairs with cytosine. (from National Human Genome Research Institute)
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