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:
(i) Ribonucleosides and (ii) Deoxyribonucleosides.
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 : (i) Ribonucleotides and (ii) Deoxyribonucleotides.