A) T-lymphocyte
B) B-lymphocyte
C) I-lymphocyte
D) P-lymphocyte
Correct Answer: B
Solution :
The term humor refers to plasma and lymph. B-lymphocytes mature within the bone marrow. The progeny of B-cells differentiate into memory B-cells and effector B-cells called plasma cells. A singe plasma cell can secrete more than 2000 molecule of antibody per second. Secreted antibodies are major effector molecules of humoral immunity.
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