The class of an immunoglobulin
A) is determined by the Class I and Class II major histocompatibility complex proteins.
B) is determined by the carbohydrate attached to the light chain.
C) is determined by the antigen.
D) is determined by the heavy chain type.
E) is determined by the J-chain.

Question

Quizplus · Accepted Answer

The class of an immunoglobulin is determined by the heavy chain type. There are five classes of heavy chains that determine five different classes of immunoglobulins (IgM, IgD, IgG, IgA, IgE). The heavy chain type determines the biological properties of the antibody, such as binding affinity, complement activation, and tissue distribution.

The Class of an Immunoglobulin