In DNA, the two purine bases (adenine and guanine) always bond with the pyrimidine bases (thymine and cytosine), and the pairing is quite specific: adenine with thymine and guanine with cytosine.
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- 嘌呤基(腺嘌呤,鸟嘌呤)总与嘧啶基(胞嘧啶,胸腺嘧啶)配对,并且配对有专一性:腺嘌呤对胸腺嘧啶,鸟嘌呤对胞嘧啶。