<prompt> Which of the following is class specific antigenic determinants of an IgL-chainH-chainJ-chainVariable region  <response>: Ans. b H-chain Ref A nan thunnrinian 8e, p 96, 9e, p 94 It is the class of heavy chain H which determines class of Ig, e.g. gamma y, alpha a, mu u, delta 6, epsilon e are H chain of IgG, IgA, IgM, IgD, IgE, respectively. 