Discussion
B-cells and T-cells are two types of cells involved in _______________.
Answer: D
Correct answer: Acquired immunity
B and T lymphocytes are the cells of acquired (adaptive) immunity. Each carries a receptor for one particular antigen, so the response is specific, and the survivors of a response persist as memory cells - which is why a second exposure is dealt with faster and harder. Innate immunity uses no such receptors and has no memory.
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