Multiple Choice
What is the function of the variable region of an antibody molecule?
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21. The Immune System
Classes of Antibodies
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What part of an antibody molecule binds to its targeted antigen?
A
Hinge region
B
Variable region
C
Constant region
D
Fc region
Verified step by step guidance1
Understand the structure of an antibody molecule. Antibodies are Y-shaped proteins composed of two main regions: the variable region and the constant region.
The variable region is located at the tips of the 'Y' shape. This region is unique to each antibody and is responsible for binding to specific antigens.
The constant region forms the base of the 'Y' shape and is involved in effector functions, such as interacting with other components of the immune system.
The hinge region provides flexibility to the antibody, allowing the arms of the 'Y' to move and adapt to different antigen shapes.
The Fc region is part of the constant region and is involved in binding to cell receptors and complement proteins, but not directly to antigens.
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