In active immunity, but not passive immunity, there is
A) acquisition and activation of antibodies.
B) proliferation of lymphocytes in bone marrow.
C) the transfer of antibodies from the mother across the placenta.
D) the requirement for direct exposure to a living or simulated pathogen.
E) the requirement of secretion of interleukins from macrophages.

Question

Quizplus · Accepted Answer

Active immunity requires direct exposure to a living or simulated pathogen in order to trigger an immune response and the production of antibodies. This is different from passive immunity, where pre-formed antibodies are transferred from another organism (such as a mother to her offspring). Therefore, options A, B, and E do not apply to active immunity. Option C is specific to passive immunity.

In Active Immunity, but Not Passive Immunity, There Is