<prompt> IgM is:MonomerDimerPentamerTetramer  <response>: Ans. c PentamerRef: Anatnayayan 9 e page 98AntibodyEffective valency IgM5 IgG2 IgD2 IgE2 IgA2,4Also Know Ig having maximum molecular weight: IgM First antibody produced by newborn: IgM All immuniglobulin are heat stable EXCEPT: IgE Ig present in breast milk: IgA Ig with maximum half life: IgG Ig with minimum half life: IgE Ig having maxilum serum concentration: IgG Ig having least serum concentration: IgE 