Maximum number of unusual base pairs are seen in: (A) rRNA, (B) tRNA, (C) mRNA, (D) snRNA
Answer is B. The transfer RNA show extensive internal base pairing and acquire clover leaf like structures. They contain a significant propoion of unusual bases. These include dihydrouracil (DHU) pseudouridine (Ps) and hypoxanthine. Moreover, many bases are methylated. REFERENCE : DM.VASUDEVAN.TEXTBOOK SEVENTH EDITION ; PAGE NO : 596.