Nucleoside: A nucleoside contains only two basic components of nucleic acids, i.e., a pentose sugar and a nitrogenous base. It may be represented as Sugar-base.
Depending upon the type of sugar present, nucleosides are of two types . They are- Ribonucleosides and Deoxyribonucleosides.
a. Nucleotides: A nucleotide contains all the three basic components of nucleic acids, i.e., a phosphoric acid group, a pentose sugar and a nitrogenous base. In other words, nucleotides are nucleoside monophosphates.Depending upon the type of sugar present, nucleotides like nucleosides are of two types. They are- Ribonucleotides and Deoxyribonucleotides.