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Biomolecules — Chemistry STD 12 — Question

Tamilnadu BoardEnglish MediumSTD 12ChemistryBiomolecules2 Marks
Question
What is the difference between a nucleoside and a nucleotide?
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Answer

Nucleoside is formed by the condensation of a purine or pyrimidine base with pentose sugar at position 1. When nucleoside is linked to phosphoric acid at 5 position of sugar moiety, we get a nucleotide. Hence a nucleotide has three units – Phosphate group, pentose sugar and a base, whereas nucleoside has two units – pentose sugar and a base.

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