A protein can best be defined as a polymer Naim 08:07 AP Biology A protein can best be defined as a polymer a. of amino acids. b. containing one or more polypeptide chains. c. containing 20 amino acids. d. containing 20 peptide linkages. e. containing double helices. Answer: a. of amino acids. Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+