The best evidence supporting the concept of immunological memory is:
A) The increased numbers of antigen receptors expressed by lymphocytes after primary exposure to an antigen
B) The increased levels of cytokines made by lymphocytes after primary exposure to an antigen
C) The increased rapidity and magnitude of the secondary response to the same antigen
D) The increased swelling of lymph nodes during the secondary response to the same antigen
E) The long lifespan of vertebrates, which would be impossible without immunological memory

Question

Quizplus · Accepted Answer

The increased rapidity and magnitude of the secondary response to the same antigen is the best evidence supporting the concept of immunological memory. This is because it shows that the immune system has "remembered" the antigen from previous exposure and is able to mount a quicker and more effective response upon re-exposure. This is a hallmark of immunological memory.

The Best Evidence Supporting the Concept of Immunological Memory Is