Which statement describes the adaptive immune response?

Which statement describes the adaptive immune response?

• A. It is immediate
• B. It is specific to antigens
• C. It is non-specific
• D. It lacks memory

Answer: (B)

The adaptive immune response is defined by its high specificity to the antigens it encounters. Lymphocytes—B cells and T cells—carry receptors that recognize precise molecular features (epitopes) on pathogens. When they encounter their specific antigen, these cells are activated, proliferate, and produce antigen-tailored antibodies or effector functions. A memory pool of B and T cells remains after the initial exposure, allowing a faster and stronger response if the same antigen is encountered again. This contrasts with innate immunity, which acts quickly but is non-specific and does not create lasting memory. So the statement that best describes the adaptive response is that it is specific to antigens.

The adaptive immune response is defined by its high specificity to the antigens it encounters. Lymphocytes—B cells and T cells—carry receptors that recognize precise molecular features (epitopes) on pathogens. When they encounter their specific antigen, these cells are activated, proliferate, and produce antigen-tailored antibodies or effector functions. A memory pool of B and T cells remains after the initial exposure, allowing a faster and stronger response if the same antigen is encountered again. This contrasts with innate immunity, which acts quickly but is non-specific and does not create lasting memory. So the statement that best describes the adaptive response is that it is specific to antigens.