Toxic Shock Syndrome Toxin is an example of :
A. Superantigens
B. Cytolitic toxins
C. Endotoxins
D. an exotoxin made of A-B subunits
E. More than one of the above answers are correct
Ans: A. Superantigens
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Wastes will accumulate and most nutrients would stop cycling if the ____ in the ecosystem dies
a. algae b. bacteria and fungi c. parasitic consumers d. insects e. vertebrates
Which behavioral response to the threat of predation is most likely to be selected for in a species that uses camouflage for protection from predators?
A) Behavior that mimics the behavior of the predator B) A quick escape response C) Sudden display to startle the predator D) Motionless behavior E) Cooperative behavior
What mechanisms do natural killer cells use to destroy body cells that have been infected by cancer or a virus?
What will be an ideal response?
Drug-resistant populations of microbes arise when
A) exposure to drugs selectively kills sensitive cells, allowing overgrowth of resistant cells. B) exposure to drugs causes mutations that produce resistance. C) resistant cells become numerous in a population due to their greater vigor. D) the patient becomes immune to the drug. E) synergy between medications occurs.