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Nucleotides are formed by
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purine, pyrimidine, sugar and phosphate
The nucleotide is formed by the union of a phosphate group with a nucleoside. A nucleoside infact contains a sugar molecule alongwith an organic nitrogenous base. Thus, a nucleotide contains an organic nitrogenous base (purine or pyrimidine) alongwith a sugar molecule and a phosphate group, i.e., Nucleoside $=$ Sugar molecule + organic nitrogenous base.
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