Why does natural selection favor organisms that are benthic in estuaries?
a. Changes in salinity
b. The constant movement of water.
c. Changes in temperature.
d. The high amount of nutrients.
b
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Even though there is free rotation around the glycosidic bond of nitrogenous bases, steric hindrance:
A. causes the purines to adopt only the anticonfiguration. B. causes the pyrimidines to adopt only the syn configuration. C. causes pyrimidines to adopt only the anti configuration. D. causes purines to adopt only the syn configuration. E. only affects purine bases; pyrimidines are allowed to adopt any configuration.
The DNA molecule could be compared to a
a. hairpin. b. ladder. c. key. d. globular mass. e. flat plate.
____ generally have greater population densities than less suitable sites
a. Metahabitats b. Sink habitats c. Source populations d. Source habitats e. K-selected populations
All of the following are diameters of cells that would be resolved in a microscope with a limit of resolution of 0.2 µm except
A. 0.3 µm. B. 0.2 mm. C. 0.2 µm. D. 2.0 µm. E. 0.1 µm.