Question

Compounds that contain a nitrogenous base, a sugar, and a phosphate group are called (i)_______. The nitrogenous bases that bind to the sugar are of two types;(ii)______and (iii)______, and they are linked to the sugar through (iv)______ bond.

• A. (i) Nucleotides (ii) Pyrimidines (iii) Purines (iv) N-glycosidic bond
• B. (i) Nucleosides (ii) Purines (iii) PAH (iv) Peptide
• C. (i) Nucleotides (ii) Purines (iii) Pyrimidines (iv) Phosphodiester
• D. (i) Nucleotides (ii) Purines (ii) Pyrimidines (iii) Disulfide

Answer 1

The correct option is A

(i) Nucleotides (ii) Pyrimidines (iii) Purines (iv) N-glycosidic bond

The basic unit of a nucleic acid is a nucleotide. It is formed by a nitrogenous base, a sugar and a phosphate group. The nitrogenous bases that bind to the sugar are of two types; purines consisting of adenine and guanine and pyrimidines consisting of cytosine, thymine in DNA and uracil in RNA. The nitrogenous base links to the sugar through an N-glycosidic bond.