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为了使DNA形成双链结构，重复或与RNA相互作用，碱基必须能够在一致的paxern中连接，以维持DNA序列。这涉及所谓的互补碱配对。嘌呤必须始终与嘧啶搭配，以维持相互间隔的两个分子之间的操作/mal距离。The complementary base pairing that occurs is: • The purine adenine (A) always pairs with the pyrimidine thymine (T) by forming two hydrogen bonds • The purine guanine (G) always pairs with the pyrimidine cytosine (C) by forming three hydrogen bonds • In an RNA sequence, the base thymine is replaced by uracil (U), and so this pairs with adenine 反而。
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