Which one of the following is a characteristic of the adaptive immune system?
A. it acts immediately or within hours of appropriate stimulus
B. it involves granulocytes (myeloid white blood cells)
C. its response is enhanced on repeated exposure to antigen/pathogen
D. it involves one type of large, granular lymphocytes also known as natural killer cells
E. it involves macrophages
Ans: C. its response is enhanced on repeated exposure to antigen/pathogen
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