Normal bases Modified bases 7.3 tRNA contains modified bases that 真”0 influence its pairing Uridine s ibothymidine(D) Dihydrour idine( D)Pseudour id ine()4-thiou dine(S uI properties gure 7.6 All of Cytidine 3-methylcytidine 5-methylcytidine the four bases in tRNa can be Adenos ine modified CH o 消当 Guanosine 7-methylguanosine Queuosine(Q) cosine ( YFigure 7.6 All of the four bases in tRNA can be modified. 7.3 tRNA contains modified bases that influence its pairing properties