Which of the Following Is NOT True of Immunoglobulin Molecules

Multiple Choice

Which of the following is NOT true of immunoglobulin molecules?

A) They consist of four polypeptide chains held together by disulphide bridges.
B) They have two identical heavy chains and two identical light chains.
C) Antigenic determinants reside only in the variable region of the light chains.
D) Proteolytic cleavage can generate fragments containing the antigen-binding site.
E) Some are membrane bound.