Immune System
Major Histo Compatibility Complex (MHC) is a collection of genes arrayed on

chromosome 21 in man, chromosome 6 in mice
chromosome 17in man, chromosome 6 in mice
chromosome 6 in man, chromosome 17 in mice
chromosome 6 in man, chromosone 21 in mice

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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 cells synthesize antibodies and put them on their cell surface
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

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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
recognize peptides associated with MHC class I molecules
are secreted out into the environment to bind antigens

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