In nucleoside, the nitrogen base is attached to the first carbon of sugar by ............ bond.

Glycosidic

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Hydrogen

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Phosphodiester

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Phosphate

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Solution

The correct option is C Glycosidic
The nitrogen base is attached to the sugar molecule to form the nucleoside. The phosphate groups are attached to the structure to form the nucleotide. There is N- glycosidic bond in the nucleoside which connects the carbon number 1 of sugar with purine or pyrimidine base. The chemical bonding is known as N-glycosidic type of bond.
Thus, the correct answer is option A.

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