Which of the following statements about ozone depletion are true? (Check all that apply.)A) Concentrations of ozone-depleting chemicals continue to rise in the atmosphere.B) Chlorofluorocarbons (CFCs) are the major cause of ozone depletion.C) Free chlorine in the upper atmosphere catalyzes the conversion of O3 into O2.D) Weather conditions also influence the size of the ozone hole in the stratosphere.E) CFCs are acted on by conditions in the stratosphere to form diatomic chlorine (Cl2).
What will be an ideal response?
B, C, D, E
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A researcher lacked the necessary equipment to measure methane production so instead monitored CO2 concentration as the unknown archaeon grew and produced methane. Why might CO2 NOT decrease but methane still increase?
A) An alternative carbon source such as methanol was used. B) CO2 is not a carbon source used by methanogens. C) CO2 was used an electron donor but not as a carbon substrate. D) Methanogenic Archaea containing carboxysomes likely made measuring small losses of CO2 difficult to conclude.
You are part of a team that discovers a new nitrogen-fixing bacteria in symbiosis with a plant. As you study this new bacteria, you discover that it is photosynthetic. This bacteria is likely to be:
A. cyanobacteria. B. actinobacteria. C. proteobacteria. D. none of the above.
Centrioles are only found in plant cells
a. True b. False
All of the following made the separation of these DNA fragments possible EXCEPT
a. the negative charge of the DNA b. the percentage of G + C bases c. the porous nature of the gel d. different fragment sizes e. positive electrode placement