最佳答案
回答者：网友
ATCG是主要碱基。
修负服换服饰碱基：除主要碱基外，核酸中也有一些含量很少的稀有碱基。稀有碱基的结构多种多样，多半是主要碱基的衍生物，所以也叫修饰碱基。
tRNA往往含有较多的稀有碱基，有的tRNA含来自有的稀有碱基达到10％。
Primary bases are incorporated into the growing chain during RNA and/or DNA synthesis. 360问答Apart from adenine (A), cyto律坐游散夫断妒sine (C), guanine (G), thymine 负音入脱算位长乡认送(T) and uraci华蛋依尽两整素l (U), DNA and RNA also contain bases that have been modified af识汽冷长不ter the nucleic acid cha绝娘轻胜身in has been formed. In DNA, the most common modified base is 5-methylcytidine (m5C). In RNA, there are many modified bases, including pseudouridine (Ψ), dihydrouridine (D), inosine (I), ribothymidine (r作害专叶金好T) and 7-methylguanosine (m7G).
英文来自WIKIPEDIA 和中文不完全对英，但也差不多。你高中应该看的懂的
