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

Answer

A nucleoside is formed by the attachment of a base to$^{\ce{I}\ '}$ position of sugar.
Nucleoside $=$ Sugar $+$ Base

On the other hand, all the three basic components of nucleic acids $($i.e., pentose sugar, phosphoric acid, and base$)$ are present in a nucleotide.
​​​​​​​Nucleotide $=$ Sugar $+$ Base $+$ Phosphoric acid​​​​​​​

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