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

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

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Immune System
The role of the M cell is to

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

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Immune System
Polymorphonuclear leukocytes (or PMNs)

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

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

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

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