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BIOLOGY MODULE 3 TEST BANK QUESTIONS AND ANSWERS Monomer of proteins - ans amino acids Proteins range of functions - ans -structural -regulatory -protective -transport -storage -toxins -enzymes -hormones Parts of amino acid - ans central carbon atom bonded to: -amino group (-nh2) -carboxyl group (-cooh) -hydrogen atom -r group R group of amino acids - ans -is a variable atom/group of atoms -the only difference between 20 amino acids Amino acids are joined by - ans peptide bonds ...