A nucleotide is the monomer of a nucleic acid. Thus, the correct option is D.
What is a Monomer?
A monomer may be defined as a molecule that can typically form a bond with other molecules in order to derive an entire set of molecules known as a polymer.
Nucleotide generally forms covalent bonds with other nucleotides in order to derive a polymer which is commonly known as nucleic acid.
A nucleotide consists of a pentose sugar molecule attached to a phosphate group and a nitrogen-containing base.
The phosphate group of one nucleotide is covalently joined to the third carbon atom of the pentose sugar of the next nucleotide.
Therefore, a nucleotide is the monomer of a nucleic acid. Thus, the correct option is D.
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