<prompt> Which of the following RNA has abnormal purine bases:tRNAmRNArRNA16S RNA  <response>: t RNA has unusual bases such as Dihydrouracil DHU, pseudouridine, hypoxanthine. Ref: Textbook of Biochemistry By DM Vasudevan, 3rd Edition, Pages 355-6 ; Lippincott Biochemistry, Pages 379, 344 