Q.

With regard to B lymphocytes

A. they constitute 50% of circulating lymphocytes
B. they are found in germinal centres in the red pulp of the spleen
C. they are genetically programmed to recognise specific antigens by means of antigen specific cell surface receptors
D. they release chemical mediators when attached to IgE Type I hypersensitivity reactions
E. they are not affected by HIV infection
Answer» C. they are genetically programmed to recognise specific antigens by means of antigen specific cell surface receptors
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