Question
What is the difference between a nucleoside and a nucleotide ?

Answer

Nucleoside : A nucleoside contains only two basic components of nucleic acids i.e. a pentose sugar and a nitrogenous base.
Nitrogenous base + Pentose Sugar → Nucleoside
Depending upon the type of sugar present, nucleosides may be Riboside and Deoxyriboside.
Nucleotide: A nucleotide contains all the three basic components of nucleic acids i.e. $H _3 PO _4$, pentose sugar and a nitrogenous base.
OR
Nucleoside + Phosphoric acid → Nucleotide
Depending upon the type of sugar present, nucleotides like nucleosides are of two types:
(i) Ribonucleotides, (ii) Deoxyribonucleotides.

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