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The class of an immunoglobulin

  • A.is determined by Class I and Class II major histocompatibility complex proteins
  • B.is determined by the carbohydrate attached to the light chain is 
  • C.determined by the antigen 
  • D.is determined by the heavy chain type

Answer: D

Correct answer: is determined by the heavy chain type

The five heavy chain types - mu, gamma, alpha, delta and epsilon - define IgM, IgG, IgA, IgD and IgE respectively. The light chain, kappa or lambda, is independent of class and is used to describe the antibody’s type rather than its class. Neither the antigen nor the major histocompatibility complex has any part in determining it.

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