Ncert Exercises & Solutions

Q. 2. A nucleoside differs from a nucleotide. It lacks the

(a) base

(b) sugar

(d) hydroxyl group

(c) A nitrogenous base is attached to the pentose sugar by an N-glycosidic linkage to form a nucleoside, i.e., Nucleoside=Nitroge base+Pentose sugar.

When a phosphate group is attached to the 5'-OH of a nucleoside through phosphodiester linkage, a nucleotide is formed, i.e., Nucleotide=Nitrogen base+Pentose sugar+Phosphate $({PO}_{4})$ .

So, a nucleoside differs from a nucleotide as it lacks the phosphate group.

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