Immune System
Which is not an antigen-presenting cell (or APC)?

Polymorphonuclear leukocyte (or PMN)
Dendritic cell
B cell
All of these

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Immune System
The role of the M cell is to

they use their cilia to propel mucus out of the small intestine
pass bacteria or virus to underlying macrophages for processing and presentation of antigen
trap virus in mucus and prevent entry
induce apoptosis in virus-infected small intestinal epithelia cells

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Immune System
Which of the following statements is false regarding B cells?

B cells that recognize high concentrations of antigens (self) in the absence of other signals undergo apoptosis in the bone marrow
B cells synthesize antibodies and put them on their cell surface
B one marrow stem cells migrate to the thymus and develop into B cells
B cells can undergo class switching and produce a different antibody type

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