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)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 class and subclass of the antibody, and is responsible for other functions, such as activating the complement system and binding to various cell receptors. The variable region is the binding site for antigens, and is located on both the heavy and light chains of the antibody molecule.

The Constant Region of an Antibody Molecule Is