Immune System
Natural killer cells are involved in

non-specific killing of virus transformed target cells
all of these
allograft rejection
tumour 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
Polymorphonuclear leukocytes (or PMNs)

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

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Immune System
Which of the following is correct for isoantigens?

They are antigens found in all members of different species
They are antigens found in some members of different species
They are antigens found in some members of a species
They are antigens found in all members of a species

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