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

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

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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 rearrangements of the DNA encoding the variable regions of the heavy and light chains
Both (a) and (b)
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

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Immune System
Polymorphonuclear leukocytes (or PMNs)

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

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