Immune System
Macrophages are professional antigen- presenting cells. The protein molecule through which they present antigen in human is

interleukin
CD8
HLA
actin

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Immune System
Polymorphonuclear leukocytes (or PMNs)

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

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Immune System
Which of the following statements is false regarding B cells?

B cells that recognize high concentrations of antigens (self) in the absence of other signals undergo apoptosis in the bone marrow
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 synthesize antibodies and put them on their cell surface

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