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

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

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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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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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Immune System
The role of the M cell is to

they use their cilia to propel mucus out of the small intestine
trap virus in mucus and prevent entry
induce apoptosis in virus-infected small intestinal epithelia cells
pass bacteria or virus to underlying macrophages for processing and presentation of antigen

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