In which of the following situations is genetic drift likely to occur?
A. A small population of lizards is isolated on
a small island.
B. A mouse develops a fur coat that enables
it to hide more readily from predators.
C. Two schools of tuna merge together to
form one large population.
D. A river changes course, changing the local
environment for a population of butterflies.
A
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The process that produces mRNA from DNA is called
A. transcription. B. translation. C. replication. D. processing. E. post-translational modification.
Which three factors determine the ecological efficiencies of consumers?
a. assimilation and harvesting efficiencies, and nutrient volume b. assimilation and harvesting efficiencies, and water volume c. production, harvesting, and assimilation efficiencies d. production and harvesting efficiencies, and amount of sunlight e. production and harvesting efficiencies, and percentage of decomposers
Prior to staining, smears of microorganisms are heat-fixed in order to
A. ensure removal of dust particles from the slide surface. B. create small pores in cells that facilitates binding of stain to cell structures. C. allow eventual visualization of internal structures. D. attach it firmly to the slide.
Elucidation of the histone code might
A. allow us to turn specific genes on or off. B. lead to chromatin remodeling. C. allow us to control translation. D. allow the determination of nucleosome composition.