What is the role of memory cells?
A) remain in the lymphoid tissue to rapidly proliferate and differentiate upon subsequent exposure to the same pathogen
B) suppress the cellular response once the infection has passed
C) circulate in the body at elevated levels to maintain an active attack against any possible pathogen
D) prevent an immune response against members of the normal microbiota
E) provide immune protection specifically for central nervous system
Answer: A
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When the ?G°' of a chemical reaction is positive (K'eq < 1.0) under standard conditions,
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Which of the following is a bacterial structure of motility?
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