What are proteins made of?

Step-by-step solution

Proteins are polypeptides . They are linear chains of amino acids linked by peptide bonds.Each protein is a polymer of amino acids. As there are 20 types of amino acids (e.g., alanine, cysteine, proline, tryptophan, lysine, etc.), a protein is a heteropolymer and not a homopolymer. A homopolymer has only one type of monomer repeating ‘n’ number of times.