Question

Identify the organic compound and its component '$X$'

• A. Cholesterol - Guanine
• B. Amino acid - $N{H}_2$
• C. Nucleotide - Adenine
• D. Nucleoside - Uracil

Answer 1

The correct option is D Nucleoside - Uracil

The nucleoside is made up of nitrogenous bases and sugar. 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.

Uracil is linked to 1' carbon of the ribose sugar and esterified with tri-phosphoric acid at the 5' position. It acts as a substrate for synthesis of RNA during transcription.

So, the correct answer is option D.