micro 250 quiz 3.docx - E coli bacteria normally live in the human gut and produce vitamin K that the body uses This is best termed a relationship

micro 250 quiz 3.docx - E coli bacteria normally live in...

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E. coli bacteria normally live in the human gut and produce vitamin K that the body uses. This is best termed a ______ relationship. Select one: a. parasitic b. saprobic c. antagonistic d. mutualistic Feedback The correct answer is: mutualistic Question 2 Correct 4.50 points out of 4.50 Flag question Question text Termites are insects that require the protozoan Trichonympha in their gut to synthesize the enzyme cellulase to degrade the cellulose in wood. The protozoan uses the end products of the cellulose breakdown (glucose). This is a(n) ______ relationship. Select one: a. commensualistic b. mutualistic c. parasitic 0 qaid=55847590&q 0 3
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d. antagonistic Feedback The correct answer is: mutualistic Question 3 Correct 4.50 points out of 4.50 Flag question Question text As described in "A Note About Bacterial Reproduction -- and the "Culture Bias,"" the organism Epulopiscium does not divide by binary fission. Rather, each cell increases in size and divides to produce multiple daughter cells that are held within the original cell well. After lysis, those daughters are released to repeat the process. Assuming Epulopiscium could be grown in pure culture in the laboratory in broth and on solid media (it currently cannot), which method would be best for measuring the increase in biomass during growth? Select one: a. Turbidity readings from a spectrophotometer; the increase in biomass will directly vary with the turbidity of the culture. b. The viable plate count; each colony derives from a single cell and the number of colonies equals the number of cells. c. Direct microscopic count; the experimenter can directly count the number of cells and extrapolate to the biomass. d. Chemostat growth; it will prevent the culture from entering the death phase. Feedback The correct answer is: Turbidity readings from a spectrophotometer; the increase in biomass will directly vary with the turbidity of the culture. 0
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