Immune System
Natural killer cells are involved in

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

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Immune System
Polymorphonuclear leukocytes (or PMNs)

are derived from bone marrow stem cells
All of these
are a type of phagocyte that can engulf and kill bacteria
can be attracted to the site of an infection following activation of complement

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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
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

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