Immune System
Which is not an antigen-presenting cell (or APC)?

Polymorphonuclear leukocyte (or PMN)
B cell
All of these
Dendritic cell

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

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