Question

In nucleoside, nitrogen base is attached in pentose sugar at

• A. Carbon-$5^{{}^{\prime }}$ of pentose sugar
• B. Carbon-$1^{{}^{\prime }}$ of pentose sugar
• C. $N-1$ and $N-9$
• D. Both B and C

Answer 1

Answer: (B)

Carbon-$1^{{}^{\prime }}$ of pentose sugar

A nucleoside consists of a pentose sugar to which a nitrogen base is attached by a glycosidic bond. The sugar may be ribose or deoxyribose. The nitrogenous bases are purines or pyrimidines. Nitrogen base is attached to the C-1 of the pentose sugar.