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
T cell receptors (or TCR) on CD4+ T cells

recognize peptides not associated with MHC molecules
are secreted out into the environment to bind antigens
recognize peptides associated with MHC class I molecules
recognize peptides associated with MHC class II molecules

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Immune System
The role of the M cell is to

trap virus in mucus and prevent entry
induce apoptosis in virus-infected small intestinal epithelia cells
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

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

B cells can undergo class switching and produce a different antibody type
B one marrow stem cells migrate to the thymus and develop into 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

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