The constant region of an antibody molecule is
A) the binding site for antigens.
B) part of the heavy chains only.
C) the same in all antibodies of a certain type.
D) at the tips of light chains only.
E) the binding site for two antigens.

Question

Quizplus · Accepted Answer

The constant region of an antibody molecule is the same in all antibodies of a certain type. This region determines the isotype of an antibody and thus its function in the immune system. The variable region, on the other hand, is responsible for antigen binding and is unique to each antibody.

The Constant Region of an Antibody Molecule Is