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一般国内教材告诉读者：脱氧核糖核酸（ＤＮＡ）含ＡＴＣＧ４种碱基，而核糖核酸（ＲＮＡ）则含ＡＵＣＧ４种碱基。从碱基组成看，两者之间仅有一个碱基的差别，ＤＮＡ中的Ｔ在ＲＮＡ中被Ｕ取代，而Ｕ和Ｔ两者在化学结构上仅相差一个甲基。可是转移核糖核酸（ｔＲＮＡ）的ＲＮ
General domestic textbooks tell the reader: DNA contains ATCG4 kinds of bases, while RNA (RNA) contains AUCG4 kinds of bases. Judging from the base composition, there is only one difference between the two bases. T in DNA is replaced by U in RNA, while both U and T differ in chemical structure by only one methyl group. RN which transports ribonucleic acid (tRNA)