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

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

Answer: (A)

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 the protein chain.
3. Identify the common types of biological monomers: amino acids, fatty acids, nucleotides, and monosaccharides.
4. Recognize that amino acids are the specific monomers that polymerize through peptide bonds to form proteins.
5. Conclude that the monomer (basic building block) of a protein is an amino acid.