| 释义 |
DEFINITIVE EXAMPLES 权威例句〔base〕One of the purines (adenine and guanine) or pyrimidines (cystosine, thymine, and uracil) that occurs attached to the sugar component of DNA or RNA.碱基：嘌呤（腺嘌呤和鸟嘌呤）或嘧啶（胸嘧啶、胸腺嘧啶和尿嘧啶）的一种，附着在脱氧核糖核酸或核糖核酸的糖分子上美国传统〔pyrimidine〕Any of several basic compounds derived from or structurally related to pyrimidine, especially the nucleic acid constituents uracil, cytosine, and thymine.嘧啶类：由嘧啶衍生出来或在结构上与嘧啶有关的一种基本混合物尤指核酸组成的尿嘧啶，胞嘧啶和胸腺嘧啶美国传统 |