Base pairing The bonding relationship between purine and pyrimidine bases in the nucleotides of DNA and RNA.碱基配对：在DNA和RNA的核苷酸中，嘌呤和嘧啶之间相匹配的关系。
The base ratio of 1:1 for the bases adenine and thymine and the bases cytosine and guanine was the first clue to the spe在核酸中的碱基配对高度专一性的原则决定了腺嘌呤与胸腺嘧啶，或鸟嘌呤与胞嘧啶之间的比值为1：1。