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 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 synthesize antibodies and put them on their cell surface

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Immune System
Polymorphonuclear leukocytes (or PMNs)

All of these
are a type of phagocyte that can engulf and kill bacteria
are derived from bone marrow stem cells
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?

In the thymus, CD8 T cells undergo positive selection only, whereas CD4 T cells undergo negative selection only
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
CD8 T cells only recognize virus-infected cells

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