Multiple Choice
How many classes of human immunoglobulins are there in the immune system?
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21. The Immune System
Classes of Antibodies
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Which part of an antibody recognizes and binds to antigens?
A
Fc region
B
Variable region
C
Hinge region
D
Constant region
Verified step by step guidance1
Understand the structure of an antibody: Antibodies are Y-shaped proteins composed of two main regions - the variable region and the constant region.
Identify the function of the variable region: The variable region is located at the tips of the Y-shaped antibody and is responsible for recognizing and binding to specific antigens.
Differentiate between the variable and constant regions: The constant region determines the class of the antibody and mediates immune responses, while the variable region is unique to each antibody and allows for antigen specificity.
Consider the role of the Fc region: The Fc region is part of the constant region and interacts with cell receptors and complement proteins, but does not bind to antigens.
Conclude that the variable region is the part of the antibody that recognizes and binds to antigens, providing specificity to the immune response.
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