Question

Which of the following statements is true regarding adaptive immunity?

• A. Prior exposure to antigen is essential
• B. Prior exposure to antigen is not essential
• C. It is a non-specific defence mechanism
• D. Macrophages are the major cells involved

Answer 1

The correct option is A Prior exposure to antigen is essential

In the case of adaptive or acquired immunity, if the body of an individual is infected, it produces antibodies against the antigens along with the memory T cells and B cells. The response is specific for the antigen.

The first response to the exposure is a slow process but when the body of an individual is adapted towards the pathogen then it will result in a quick response on subsequent exposures.

Thus, adaptive immunity requires exposure to antigen to develop, T and B lymphocytes are the major cells involved and it is a specific defence.