Identify the true statement about exotoxins.
A. They are structural proteins on the exterior surface of bacteria.
B. They nonspecifically activate host complement and coagulation cascades.
C. They bind to specific receptors on host cells.
D. They promote bacterial adhesion
Answer: C. They bind to specific receptors on host cells.
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A. trophic pyramid; food web B. food web; trophic pyramid C. food web; circuit D. trophic pyramid; circuit
As part of a lab exam, you are given a vial of orange crystals. When you add them to pure, neutral pH water, the pH changes to 13. Other tests show that the crystals consist of a single chemical. You could conclude the chemical is
What will be an ideal response?
Describing bacterial conjugation, which of the following matings is most likely to result in a change from F- to F+?
A) donor F? recipient F+ B) donor Hfr recipient F+ C) donor Hfr recipient F- D) donor F? recipient Hfr E) donor F+ recipient F?
Toxoids
A. are always genetically engineered. B. contain modified bacterial exotoxin molecules. C. confer passive immunity. D. contain select antigenic components of a pathogen rather than whole cells or viruses. E. All of these choices are correct.