When activated by the presence of a pathogen some lymphocytes produce antibodies and other lymphocytes act as memory cells.
Which of the following best describes the role of memory cells in the immune system?
A. They store antigens from the pathogen for lymphocytes to use as a template for antibodies in the future.
B. They remember the antigen on the pathogen and tell the lymphocytes how to respond if it is re-encountered.
C. They quickly clone to form a group of phagocytes if the pathogen is re-encountered.
D. They quickly clone to form a group of plasma cells if the pathogen is re-encountered.
Select your answer:
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Which of the following is an example of domestication?
A. Dogs being selectively breed for traits beneficial to humans for thousands of years.
B. Training a squirrel to navigate a maze using food as a reward.
C. Elephants being held in captivity in a zoo.