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6. In human B cells and T cells are matured in the

A. bone marrow and thymus respectively
B. lymph nodes and spleen respectively
C. bursa and thymus respectively
D. none of these

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7. An example of mosaic antigen is

A. virus
B. bacteria
C. a hapten
D. protein

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8. T cells are the source of

A. interleukin
B. interferon
C. lymphotoxin
D. all of these

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9. The primary B cell receptor is

A. IgD
B. IgG
C. IgA
D. IgE

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10. It is highly valued if the lymphocytes derived from the lymph node or tonsil tend to undergo fusion at

A. high frequencies
B. moderate frequencies
C. low frequencies
D. at no frequency

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