<prompt> Which of the following determines the class of immunoglobulin?L-chainH-chainJ-chainVariable region  <response>: Based on the constant region of the heavy chains g, a, m, d and e;Ig has been classified into five types; lgG, IgA, IgM, IgD and IgE respectively. Differences inheavy chain H chain polypeptides allow these immunoglobulinsto function in different types of immune responses and at paicular stages of the immune response. 