Which of the following secondary lymphoid organs or tissues filters blood and traps blood-borne microorganisms and antigens?
A) Lymph nodes
B) Lymphoid tissues
C) Spleen
D) All of the above
Ans: C) Spleen
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The major virulence factors of Yersinia pestis are carried on
A. the chromosome. B. a plasmid. C. three separate plasmids. D. nuclear membrane.
Rank, from low to high, the pH of blood, stomach acid, and urine
A) blood, urine, and stomach acid B) stomach acid, blood, and urine C) urine, blood, stomach acid D) stomach acid, urine, blood
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