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?

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

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