Abnormal base in tRNA is: (A) Dihydrouracil, (B) Orotic acid, (C) Methyl Xanthine, (D) Cystine
Answer is A. The D Arm or DHU region is so named due to the presence of a dihydrouridine in that areaThe DHU arm serves as the recognition site for the enzyme which adds the amino acidRef: DM Vasudevan, 7th edition, page no: 597