M Prep | MCAT 2015 Question of the Day - Prep, Practice Questions, and More!

Q:	The innate immune system is an ancient defense mechanism found in many organisms. One characteristic of an innate immune system compared with the adaptive immune system is the inability to establish immunological memory. Which of the following incidents will establish immunological memory?

viral antigen exposure

infection with worm parasites in the blood

inflammation from cells damaged by a clean cut

endotoxin from lipopolysaccharide of Gram-negative bacteria such as E. coli