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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

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B

(i) Nucleosides (ii) Purines (iii) PAH (iv) Peptide

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C

(i) Nucleotides (ii) Purines (iii) Pyrimidines (iv) Phosphodiester

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D

(i) Nucleotides (ii) Purines (ii) Pyrimidines (iii) Disulfide

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Solution

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.

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