One hypothesis proposes that an asteroid impact at the end of the ___________ led to the extinction of dinosaurs. Fill in the blank(s) with the appropriate word(s)
ANSWER: Cretaceous
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The adenylation of DNA ligase is:
A. an unstable initial step in the reaction. B. occurs at a lysine residue in the DNA binding domain. C. dependent on the presence of DNA. D. independent of the presence of DNA. E. more efficient at lower pH.
Which of the following best states the hypothesis tested by Abrams and Townsend while investigating the natural selection of copepods that avoid predation of bioluminescent dinoflagellates?
A. Copepods that avoid bioluminescent dinoflagellates have a smaller chance of being eaten by predators than do copepods that remain near and feed on the bioluminescent dinoflagellates. B. None of the answer choices is correct. C. The light emitted by bioluminescent dinoflagellates is of sufficient wavelength and energy to be dangerous to feeding copepods. D. The bioluminescent dinoflagellates produce enough light that they can also photosynthesize at night, harming the copepods. E. Bioluminescent flagellates benefit from selection of flashing, because it startles the copepods.
Nitrogen fixation is a process that _____
A) recycles nitrogen compounds from dead and decaying materials B) converts ammonia to ammonium C) releases nitrate from the rock substrate D) converts nitrogen gas into ammonia
A new industrial park in your community dumps its wastewater into a large aerated pond, to which nutrients are added. The water from this pond makes its way into a nearby marsh, which eventually drains into a slow-moving stream. This is an example of
A) artificial bioremediation. B) natural bioremediation. C) bioreporter use. D) natural fermentation. E) a method to make potable water.