Q. 9

Nucleic acids are the polymers of ______________.
A. Nucleosides

B. Nucleotides

C. Bases

D. Sugars

Answer :

Nucleic acids are the polymers of nucleotides and they are joined together by a phosphodiester linkage. Nucleotides are the structural units of nucleic acids and are composed of a nitrogenous base, a five carbon sugar and a phosphate group. Thus, option (ii) is correct.

Option (i) is incorrect because nucleosides are composed of a nitrogenous base and a five carbon sugar. They don’t have the phosphate groups. So, they don’t have a phosphodiester linkage.


Options (iii) and (iv) are incorrect because nucleic acids are the polymers of nucleotides and not just nitrogenous bases or pentose sugars.

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