1.Phosphate group
2. Pento sugar group
3.Nitrogenous based group
PENTO SUGAR GROUP
They are monosaccharides having 5 carbons
There are 2 types of pento sugars
1. Ribose
2. Deoxy ribose
NITROGENOUS BASED GROUP
They are nitrogen containing organic molecule which can be found in nucleic acid.
There are 5 types of nitrogenous bases
1.Adenine
2.Guanine
3. Thiamine
4.Cytosine
5.Uracil
Nitrogenous bases can be divided into 2 groups
1.Purine
2. Pyrimidines