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Nucleic Acids - Medical Science

Q1:

Nucleoside is a pyrimidine or purine base

A covalently bonded to a sugar

B ionically bonded to a sugar

C hydrogen bonded to a sugar

D none of the above

ANS:A - covalently bonded to a sugar

Nitrogen base is bound to the sugar by the means of glycosidic bond and the glycosidic bond is a covalent bond so either pyrimidine or purine are bound to the sugar by the means of covalently bound glycosidic bond.