<prompt> Structure of antibodies is composed of -Single peptide chainTwo peptide chainNon sulphur amino acid2 long and 2 sho peptide chains  <response>: Antibody or immunoglobulin are glycoproteins molecules consisting of four polypeptide chains. - two identical heavy chains H , molecular weight 50 kDa. - two identical light chains L, molecular weight 25kDa. - the heavy chains are of five types called alpha, gamma, delta , epsilon and mu. - light chains are similar in all class of immunoglobulins. Reference : Anathanarayan panikers 9th edition, pg no: 94 p 