Immune System
Which of the following is correct for CD8 T cells?

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

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Immune System
The role of the M cell is to

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

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