Question

Which region of an antibody molecule determines its class and remains consistent within a type of antibody?

Options

• Antigen-binding region

• Variable region

• Constant region

• Hinge region

Answer 1

The constant (C) region of an antibody determines the antibody class and remains consistent within a particular type. This region is responsible for the classification of immunoglobulins (IgG, IgM, IgA, IgD, IgE) and their respective functions.