Which of the following is NOT a mechanism by which sulfate reducers may contribute to corrosion?
a. anaerobic respiration of organics forming acetate, which is acidic
b. consumption of H2, accelerating electrochemicalpitting
c. direct electron uptake from metal surface
d. production of corrosive H2S
Answer: A
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If you get a Simpson's index of 1, this means
A) there is only one species in the community. B) all species are in equal proportions. C) the calculation is incorrect as this is theoretically impossible. D) the Shannon index will equal 0.
As animals take in food energy, approximately 10% of it is made available to the next level in the food chain. Which of the following is one of the ways in which the energy is used by the organism and not passed along?
A. death B. cellular respiration C. excretion D. defecation E. All of these are ways in which the organism uses the energy.
The best explanation for why the keratin from a melanocyte is different from the keratin from a keratinocyte would be:
A. differences in the function of these two types of cells. B. differences in the cytoskeleton of these two types of cells. C. differences in the shape of these two types of cells. D. differences in the keratin genes in these two types of cells.
Which factors govern the rate of primary productivity in freshwater and marine ecosystems?
a. availability of water b. availability of sunlight and nutrients only c. depth of the water only d. depth of the water and availability of sunlight and nutrients e. availability of oxygen