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

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

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Immune System
The role of the M cell is to

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

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

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

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Immune System
Polymorphonuclear leukocytes (or PMNs)

can be attracted to the site of an infection following activation of complement
All of these
are derived from bone marrow stem cells
are a type of phagocyte that can engulf and kill bacteria

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