Immune System
Which of the following(s) is/are the determinants of antigenicity?

Size of the antigen
Foreignness
All of these
Chemical nature

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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
they use their cilia to propel mucus out of the small intestine
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 is correct for CD8 T 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
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

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