Memory in adaptive immunity is best described as?

• A. It refers to the immediate non-specific defense mechanisms.
• B. It depends on ongoing antigen presence to function.
• C. It involves memory B and T cells enabling faster responses upon re-exposure.
• D. It cannot be transferred between individuals.

Answer: (C)

Memory in adaptive immunity refers to the ability of the immune system to respond more quickly and effectively to a pathogen after an initial encounter. This speed and strength come from memory B and memory T lymphocytes that are formed during the first exposure. When the same antigen appears again, these memory cells recognize it and proliferate rapidly, producing a stronger secondary response with antibodies that are often higher affinity. This anticipatory readiness is what makes memory immune responses much faster than primary responses.

That’s why the best description is that memory involves memory B and T cells enabling faster responses upon re-exposure. The other statements describe innate defenses, responses that rely on ongoing antigen presence, or claims about transferability that aren’t accurate for memory specifically.