The base ratio of 1:1 for the bases adenine and thymine and the bases cytosine and guanine was the first clue to the specificity of BASE PAIRING in the nucleic acids. 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。
adenine and thymine 腺嘌呤和胸腺嘧啶
The letters A, C, G, and T stand for adenine, cytosine, guanine, and thymine respectively, the basic building blocks of DNA. 字母A.
Then we concluded that the DNA molecule can absorb on the Ag colloid particle through its adenine and C=O of thymine. 阴离子的增强效应是物理增强机制和化学增强机制同时在起作用。