The class of antibody able to cross the placenta from mother to fetus is
Correct answer: C. IgG
- A. IgA
- B. IgE
- C. IgG
- D. IgM
Explanation
IgG is the smallest and most abundant immunoglobulin in plasma and the only one transported across the placenta, so it gives the fetus and the newborn several months of borrowed protection. IgA is the antibody of secretions, including breast milk, and protects mucous surfaces after birth. IgE mediates allergy and IgM is the large first antibody made in a primary response.
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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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