Question

multiple-choice question
the building block (or monomer) of a nucleic acid is a
amino acid
monosacharride
fatty acid
nucleotide
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Explanation:

Nucleic acids (such as DNA and RNA) are made up of nucleotides. A nucleotide consists of a nitrogen - containing base, a pentose sugar (ribose in RNA and deoxyribose in DNA), and a phosphate group.
Amino acids are the building blocks of proteins. Monosaccharides are the building blocks of carbohydrates. Fatty acids are components of lipids (along with glycerol in the case of triglycerides).

Answer:

nucleotide