Amino Acids,Peptides,and Proteins Amino acids are difunctional Contain both a basic amino group and an acidic carboxyl group H2N c=0 OH Alanine,an amino acid Can join together into long chains by forming bonds between the- NH2 of one amino acid and the-CO2H of another Peptides are chains with fewer than 50 amino acids Proteins are large chains of amino acids Amide bonds ManyAmino acids are difunctional ▪ Contain both a basic amino group and an acidic carboxyl group ▪ Can join together into long chains by forming bonds between the – NH2 of one amino acid and the –CO2H of another ▪ Peptides are chains with fewer than 50 amino acids ▪ Proteins are large chains of amino acids Amino Acids, Peptides, and Proteins