Answer: active immunity.
- A active immunity
- B passive immunity
- C innate immunity
- D no immunity
Correct answer: A. active immunity
Explanation: Recovering from an infection produces active immunity, as the body makes its own antibodies.
An antibody is Y-shaped, with two identical antigen-binding sites at the tips of the variable regions - each shaped to recognise one specific antigen - while the constant (Fc) region at the base is recognised by immune cells to trigger further responses.
Concept context
Innate and adaptive immunity, B cells, T cells, antibodies, vaccines, and immune disorders. Critical for NEET.