Proteins are composed of one or more polypeptide chains Protein---One or more polypeptide chains One polypeptide chain-a monomeric protein More than one- multimeric protein Homomultimer -one kind of chain Heteromultimer two or more different chains Hemoglobin, for example, is a heterotetramer It has two alpha chains and two beta chainsProteins are composed of one or more polypeptide chains Protein---One or more polypeptide chains • One polypeptide chain - a monomeric protein • More than one - multimeric protein • Homomultimer - one kind of chain • Heteromultimer - two or more different chains • Hemoglobin, for example, is a heterotetramer • It has two alpha chains and two beta chains