Which of the following is accounted for by immunological memory?
A)the human body's ability to distinguish self from nonself
B)the observation that some strains of the pathogen that causes dengue fever cause worse disease than others
C)the ability of a helper T cell to signal B cells via cytokines
D)the ancient observation that someone who had recovered from the plague could safely care for those newly diseased
E)the ability of the immune system to present antigen fragments in association with MHC antigens

Question

Quizplus · Accepted Answer

Immunological memory is the ability of the immune system to "remember" and quickly respond to a pathogen that the body has encountered before. This is what allows someone who has recovered from a disease (such as the plague) to be protected from it in the future.

The other answer choices are not examples of immunological memory: 
A) the ability to distinguish self from nonself is a fundamental characteristic of the immune system, but not specifically related to memory 
B) the observation about different strains of dengue fever is more related to pathogen variability and genetics 
C) the ability of helper T cells to signal B cells via cytokines is important for immune responses, but not specific to memory 
E) the ability to present antigen fragments with MHC antigens is another important aspect of the immune response, but not specific to memory.

Which of the Following Is Accounted for by Immunological Memory