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A nuceoside is composed of two components of nucleic acids is a pentose sugar and a nitrogenous loss. It is formed when 1-position of the pyramidine or 9-position of purine is linked to
of the sugar (ribase or deoxyribase) by a B-linkage . A nucleotide contains all the three basic components of nucleic acids i.e, a phosphoric acid group, a pentose sugar and a nitrogenous base formed by esterification of 
of sugar of nucleoxide with phosphoric acid.