In biochemistry, what is the monomer (basic building block) of a protein?

• A. A monosaccharide
• B. An amino acid
• C. A fatty acid
• D. A nucleotide

Answer: (B)

Verified step by step guidance

1. Understand that proteins are large biomolecules made up of smaller units called monomers.
2. Recall that the monomers of proteins are the building blocks that link together to form polypeptide chains.
3. Identify the four options given: monosaccharide, amino acid, fatty acid, and nucleotide, and recognize which biomolecules they are associated with (e.g., monosaccharides with carbohydrates, fatty acids with lipids, nucleotides with nucleic acids).
4. Know that amino acids are the specific monomers that combine via peptide bonds to form proteins.
5. Conclude that the correct monomer of a protein is an amino acid.