Which of the following are least likely to play a role in the nitrogen cycle?
A) indigenous microflora
B) nitrifying and denitrifying bacteria
C) nitrogen-fixing bacteria
D) bacteria living in the root nodules of legumes
A) indigenous microflora
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When antiseptics and disinfectants are compared, antiseptics are generally
A. unpredictable in toxicity. B. equally as toxic. C. more toxic. D. less toxic.
You have discovered a new microorganism, but you want to know if it is a eukaryote or a prokaryote. To investigate this question you prepare a slide with a simple stain and view it with a light microscope with a 40X objective lens and 10X ocular lens
You also prepare a control slide using Saccharomyces cerevisiae (a unicellular eukaryote). You can see the cells on your control slide, but you don't see cells when you look at your unknown microorganism. What can you conclude from this experiment? A) The experiment failed to visualize the organism because the stain killed it. B) Your new unknown microorganism is probably a virus. C) The cells of the new unknown microorganism may be too small to see with the objective and ocular lenses you used. D) The new unknown microorganism is probably an archaeon.
Dehydration in animals __________.
a. is always lethal b. that are exceptionally small, such as the tardigrade, is not usually fatal because of their large surface area-to-volume ratio c. is, on a cellular level, the opposite of freezing d. is a problem because fluid-mosaic cell membranes fall apart when deprived of water e. may be less damaging in the presence of sugar
Which microscope would be used for viewing bacteria?
A. electron microscope B. compound microscope C. dissecting microscope D. a and b E. a, b and c