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The basic unit of nucleic acid is

1. Pentose sugar
2. Nucleoid
3. Nucleoside
4. Nucleotide

Correct answer: Nucleotide

Solution

A nucleotide is the basic building block of nucleic acids like DNA and RNA. It consists of a pentose sugar, a phosphate group, and a nitrogenous base, which together form the repeating unit of the polymer.

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