In the primary immune response, detectable antibody appears only after
Correct answer: C. several days
- A. a few minutes
- B. about an hour
- C. several days
- D. about a year
Explanation
The lag of roughly five to ten days is the time needed for the one matching lymphocyte to be selected, to divide into a clone and for plasma cells to build up antibody production. This delay is why a first infection makes a person ill while the same infection later may pass unnoticed. In the secondary response the lag shrinks to a day or two and the antibody level reaches a far higher peak.
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About Specific Defense Mechanism
Specific defense mechanisms provide targeted immunity through B lymphocytes, T lymphocytes, antibodies and memory cells that recognize particular antigens. Questions cover humoral and cell mediated responses, clonal selection, primary and secondary immune responses, vaccination and passive immunity, while distinguishing adaptive defenses from the immediate, non specific innate response.
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