Immune System
Which of the following statements is false regarding B cells?

B one marrow stem cells migrate to the thymus and develop into B cells
B cells that recognize high concentrations of antigens (self) in the absence of other signals undergo apoptosis in the bone marrow
B cells synthesize antibodies and put them on their cell surface
B cells can undergo class switching and produce a different antibody type

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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 the combination of different heavy and light chains that form the antigen binding site
By rearrangements of the DNA encoding the variable regions of the heavy and light chains

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Immune System
Which of the following is correct for isoantigens?

They are antigens found in all members of different species
They are antigens found in some members of different species
They are antigens found in all members of a species
They are antigens found in some members of a species

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