The Antigen -Binding Region of an Antibody Is Formed by the

Multiple Choice

The antigen -binding region of an antibody is formed by the

A) variable region composed of a heavy chain and a light chain.
B) variable region composed of two heavy chains.
C) variable region composed of two light chains.
D) constant region composed of a heavy chain and a light chain.
E) constant region composed of two light chains.