Q10: Which of the followings cross
placenta?
a) IgM
b) IgA
c) IgG
d) IgD
Correct Answer: c
Explanation:
Of all the immunoglobins only IgG is
the only antibody that crosses placenta. It is main antibody in secondary
response and the most abundant one. It fixes complement, opsonized bacteria,
neutralizes bacterial toxins and viruses.
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