Textbook Question
The main cellular target of the HIV virus that causes AIDS is
a. Helper T cells
b. Cytotoxic T cells
c. Macrophages
d. B cells
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21. The Immune System
Primary and Secondary Response of Adaptive Immunity
Multiple Choice
People that are immune to a certain disease have ________ class antibodies against the disease years later.
A
IgA.
B
IgG.
C
IgM.
D
IgE.
Verified step by step guidance1
Understand the role of different antibody classes in the immune system. The main classes are IgA, IgG, IgM, and IgE, each with specific functions.
Recall that IgG antibodies are the most abundant in the blood and are responsible for long-term immunity and memory against pathogens.
Consider the context of immunity over years. Long-term immunity is typically associated with memory cells and the presence of IgG antibodies.
Review the characteristics of IgG: it can cross the placenta, provides passive immunity to the fetus, and is involved in secondary immune responses.
Conclude that people who are immune to a disease years later likely have IgG antibodies, as these are indicative of long-term immune memory.
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