The nucleosides obtained from DNA all contain 2-deoxy-d- ribose as their sugar component.
Adenine, guanine, cytosine, and thymine are the four heterocyclic base of DNa cucleosides.
The heterocyclic hase of a nucleotide is attached through an N-glycosidic linkage to C1' of the ribose or deoxyribose unit, and the linkage is always the α\alphaα-linkage.
The entral portion of the nucleotide is a five member monosaccharide known as furanoside.
