The Ames test to determine the ability of chemicals to cause mutations uses which bacteria?
1.Salmonella
2.Shigella
3.Staphylococcus
4.Streptococcus
5.Escherichia
1
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In the northeastern Pacific ocean, sea otters occur at a relatively low abundance. By preying upon sea urchins, sea otters maintain underwater kelp (large algae) "forests", which would otherwise be decimated by the herbivorous sea urchins. The kelp forests supply food for a wide variety of marine organisms, as well as providing refuge from predation and nursery habitat for juveniles. Based on this, what type of species best describes sea otters?
A. indicator species. B. flagship species. C. keystone species. D. dominant species. E. umbrella species.
Four of the five factors listed below affect population
size. Select the exception. a. births b. distribution c. emigration d. immigration e. deaths
Which protists produce much of the Earth's oxygen?
A. amoeba B. slime molds C. algae D. protozoa E. radiolarians
In what part of vascular plants are tracheids found?
A. rhizoids B. phloem C. cell walls D. xylem