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

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

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Immune System
The role of the M cell is to

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
they use their cilia to propel mucus out of the small intestine

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Immune System
Numerous antibodies can be prepared, against one antigen, each binds to unique epitopes. How is this antibody diversity generated?

By the combination of different heavy and light chains that form the antigen binding site
Antibody proteins can physically change their shape to bind different epitopes
By rearrangements of the DNA encoding the variable regions of the heavy and light chains
Both (a) and (b)

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Immune System
Polymorphonuclear leukocytes (or PMNs)

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

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