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Q. Nucleotides are formed by

BHUBHU 2009

Solution:

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, ie,
Nucleoside $=$ Sugar molecule $+$ organic nitrogenous base
Nucleotide $=$ Nucleoside $+$ phosphate group.