Immune System
Natural killer cells are involved in

tumour rejection
non-specific killing of virus transformed target cells
all of these
allograft rejection

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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
Which of the following statements is false regarding B cells?

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

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