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

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

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: nucleotide, amino acid, monosaccharide, and fatty acid.
4. Recognize that nucleotides are the monomers of nucleic acids (DNA and RNA), monosaccharides are the monomers of carbohydrates, and fatty acids are components of lipids.
5. Conclude that amino acids are the monomers that combine through peptide bonds to form proteins.