Immune System
Which of the following is correct for isoantigens?

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

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

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

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