Superantigens
A. are potent stimulators of T cells.
B. include erythrogenic toxin.
C. include streptolysin O.
D. induce production of tumor necrosis factor.
E. All of the choices are correct.
Answer: E
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A Rossmann fold most likely is created when:
A. the ?-?-? motif is repeated within a polypeptide. B. the Greek key motif is repeated within a polypeptide. C. an ? helix facilitates the creation of a ?-?-? barrel structure. D. an ? helix prevents the creation of a ?-?-? barrel structure. E. a dimer contains subunits that are mirror images.
The raising of more than one species of fish in a fish farming operation is called:
a. monoculture. b. mariculture. c. polyculture. d. aquaculture. e. multiculture.
The first commercial product made with recombinant DNA techniques was ____________________. Fill in the blank(s) with the appropriate word(s)
Which factor is contributing to the worldwide decline in amphibians?
A. toxic chemical pollutants B. habitat deterioration C. fatal infections D. introduction of exotic species E. All of these are contributing factors.