Final answer:
The monomer of a protein is an amino acid. Proteins are composed of long chains of amino acids, which determine their structure and function.
Step-by-step explanation:
The monomer of a protein is an amino acid. Proteins are composed of long chains of amino acids, which are linked together by peptide bonds. Each amino acid contains an amino group, a carboxyl group, and a side chain, which is unique to each amino acid. The sequence and arrangement of amino acids determine the structure and function of a protein.
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