34. In RNA, thymine is replaced by (A) Adenine (B) Guanine (C) cytosine (D) Uracil
The nitrogenous bases are purines and pyrimidines. The purines are adenine and guanine. The pyrimidines are thymine and cytosine. In RNA, the thymine is replaced by uracil. Uridylic acid is formed by the combination of uracil as a nitrogenous base, ribose sugar, and triphosphate. It is mainly found in RNA. It is an ester of phosphoric acid with the nucleoside uridine. So, the correct answer is option D.
