What virulence factor(s) of Yersinia pestis prevent(s) phagocytosis by cells of the immune system?
A) the capsule
B) leukocidins
C) murine toxin
D) V and W antigens
Answer: A
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Members of the ____ subphylum are mostly insects and were among the first animals to colonize terrestrial habitats
a. Myriapoda b. Trilobita
c. Chelicerata d. Hexapoda e. Crustacea
Biotech barnyard animals produce which of the
following human products? a. a protein that treats cystic fibrosis b. a protein that counters the effects of a heart attack c. interleukin-2 that triggers divisions of certain human immune cells d. a protein that treats blood-clotting disorders e. all of these
A linear depiction of energy flow in an ecosystem is a(n):
a. food web. b. food chain. c. trophic web. d. ecological pyramid. e. pyramid of numbers.
Pasteur's experiments on fermentation laid the foundation for
A) industrial microbiology. B) epidemiology. C) immunology. D) abiogenesis. E) antisepsis.