Textbook Question
The specificity of an antibody is determined by the
(a) Fixed segment
(b) Antigenic determinants
(c) Variable region
(d) Size of the antibody
(e) Antibody class
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21. The Immune System
Classes of Antibodies
Multiple Choice
Which antibody class crosses the placenta from mother to child?
A
IgA.
B
IgE.
C
IgM.
D
IgG.
Verified step by step guidance1
Understand the role of antibodies: Antibodies are proteins produced by the immune system to help fight infections. They are classified into different classes based on their structure and function.
Identify the antibody classes: The main classes of antibodies are IgA, IgD, IgE, IgG, and IgM. Each class has distinct functions and properties.
Focus on the function of IgG: IgG is the most abundant antibody in the blood and extracellular fluid, and it plays a crucial role in protecting against bacterial and viral infections.
Learn about placental transfer: During pregnancy, certain antibodies can cross the placenta to provide passive immunity to the fetus. This transfer is essential for protecting the newborn until its immune system matures.
Recognize IgG's unique ability: Among the antibody classes, IgG is the only one that can efficiently cross the placenta from mother to child, providing the fetus with immune protection before birth.
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