Immune System
Natural killer cells are involved in

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

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

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

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

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