Question

What is the difference between a nucleoside and a nucleotide?

Answer 1

The molecules in which one of the nitrogen bases (purine or pyrimidine) is bonded with a sugar molecule is called nucleoside.

$$Base + Sugar = Nucleoside$$.

When the phosphate group is attached to the nucleoside, the compound formed is called nucleotide.

$$Base + Sugar +Phosphate= Nucleotide$$.