Identify the given structure

Nucleoside

The correct answer is option 2. Nucleoside.

The molecules in which one of the nitrogen bases (purine or pyrimidine) is bonded with a sugar molecule is called nucleoside.

Base + Sugar = Nucleoside

The nucleosides of RNA and DNA differ in two respects:

(i)  The sugar in RNA nucleoside is ribose while the sugar in DNA nucleoside is deoxyribose.

(ii) The nucleoside of RNA contains uracil base in place of thymine present in DNA.

It may be noted that in nucleosides, the carbon atoms of sugar molecules are numbered as 1′, 2′, 3′, 4′, 5′, etc. in order to distinguish these from the bases. The purine or pyrimidine bases are attached to position 1’ of pentoses through N-glycosidic linkages. The nucleosides are named depending on the base present: