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 cells synthesize antibodies and put them on their cell surface
B cells that recognize high concentrations of antigens (self) in the absence of other signals undergo apoptosis in the bone marrow
B one marrow stem cells migrate to the thymus and develop into B cells

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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 cell receptor recognizes epitopes that are also commonly recognized by B cells
CD8 T cells only recognize virus-infected cells
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
they use their cilia to propel mucus out of the small intestine
induce apoptosis in virus-infected small intestinal epithelia cells
trap virus in mucus and prevent entry

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

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

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