Question

A nucleoside is formed of

• A. Pentose sugar, phosphate and nitrogen base
• B. Phosphate and nitrogen base
• C. Pentose sugar and phosphate
• D. Pentose sugar and nitrogen base

Answer 1

Answer: (D)

Pentose sugar and nitrogen base

The sugars which are present in the nucleotide are ribose or deoxyribose. The nitrogenous bases are purines and pyrimidines. The phosphate is present as phosphoric acid. The nucleotide is formed by the union of a phosphate group with a nucleoside. A nucleoside, in fact, contains a sugar molecule along with an organic nitrogenous base.

So, the correct answer is option D.