Immune System
Which is not an antigen-presenting cell (or APC)?

Polymorphonuclear leukocyte (or PMN)
B cell
Dendritic cell
All of these

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Immune System
Polymorphonuclear leukocytes (or PMNs)

are a type of phagocyte that can engulf and kill bacteria
All of these
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 statements is false regarding B cells?

B one marrow stem cells migrate to the thymus and develop into B cells
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
B cells synthesize antibodies and put them on their cell surface

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