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
Which of the following is correct for CD8 T cells?

In the thymus, CD8 T cells undergo positive selection only, whereas CD4 T cells undergo negative selection only
CD8 T cells only recognize virus-infected cells
CD8 T cells can kill individual virus-infected cells in a contact dependent fashion
CD8 T cell receptor recognizes epitopes that are also commonly recognized by B cells

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Immune System
The role of the M cell is to

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

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