The class of antibody that appears first in the blood during an infection and is the largest in size is
Correct answer: C. IgM
- A. IgG
- B. IgA
- C. IgM
- D. IgE
Explanation
IgM is a pentamer, the first antibody deployed in a primary response, while IgG dominates later and crosses the placenta. Knowing one signature feature per class is enough for most options.
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About Specific Defense Mechanism
Specific defense mechanisms provide targeted immunity through B lymphocytes, T lymphocytes, antibodies and memory cells that recognize particular antigens. Questions cover humoral and cell mediated responses, clonal selection, primary and secondary immune responses, vaccination and passive immunity, while distinguishing adaptive defenses from the immediate, non specific innate response.
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