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Microbiology, 2021

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762 18 • Review Questions<br />

Matching<br />

19. Match the antibody class with its description.<br />

___IgA<br />

A. This class of antibody is the only<br />

one that can cross the placenta.<br />

___IgD<br />

B. This class of antibody is the first<br />

to appear after activation of B cells.<br />

___IgE<br />

C. This class of antibody is involved<br />

in the defense against parasitic<br />

infections and involved in allergic<br />

responses.<br />

___IgG<br />

D. This class of antibody is found in<br />

very large amounts in mucus<br />

secretions.<br />

___IgM<br />

E. This class of antibody is not<br />

secreted by B cells but is expressed<br />

on the surface of naïve B cells.<br />

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