Question

Sugars are attached to the pyrimidines by the
formation of
(1) Hydrogen bond
(2) N-glycosidic bond
(3) Phosphoester bond
(4) O-glycosidic bond​

Answer 1

Sugars are attached to the pyrimidines by the formation of (2) N-glycosidic bond.

• DNA is made up of three units, the nitrogenous bases, deoxyribose sugar and phosphate.
• The anomer carbon of ribose sugar attaches with nitrogen of a pyrimidines. Such kind of bond formation is referred to as N-glycosidic bond. Hence, the correct option is N-glycosidic bond.
• Other options, such as O-glycosidic is not correct as the anomer carbon should form a bond with hydroxyl group  to form O-glycosidic bond.

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