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BIO 250 Exams 1,2 & 3 and Midterm Test Prep Questions and Answers 2022 | Graded A

Page path  BIO250_Saylor_V5  Unit 9: Microbial Genetics Started on Tuesday, September 4, 2018, 12:57 PM State Finished Completed on Tuesday, September 4, 2018, 1:42 PM Time taken 45 mins 1... 0 secs Grade 76.50 out of 90.00 (85%) Question 1 Correct 4.50 points out of 4.50 Flag question Question text When microbes live independently but cooperate and share nutrients, it is called ______. Select one: a. symbiosis b. antibiosis c. mutualism d. synergism Feedback The correct answer is: synergism Question 2 Correct 4.50 points out of 4.50 Flag question Question text When microbes are in a close nutritional relationship and one benefits but the other is not harmed, it is called ______. Select one: a. symbiosis b. commensalism c. mutualism d. synergism Feedback The correct answer is: commensalism Question 3 Correct 4.50 points out of 4.50 Flag question Question text The phase of the bacterial growth curve that shows the maximum rate of cell division is the ______. Select one: a. lag phase b. exponential phase c. stationary phase d. death phase e. prophase Feedback The correct answer is: exponential phase Question 4 Incorrect 0.00 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. Question 5 Correct 4.50 points out of 4.50 Flag question Question text Which of the following microorganisms would find hypotonic conditions most damaging? Select one: a. Bacteria b. Protozoa c. Fungi d. Algae e. Cyanobacteria Feedback The correct answer is: Protozoa Question 6 Correct 4.50 points out of 4.50 Flag question Question text Which organism has a challenge to maintain cellular electrolyte and fluid balance in its environment? Select one: a. A protozoan in a fresh water lake b. A bacterium in a fresh-water lake c. A bacterium in Great Salt Lake d. All of the above have problems in maintaining electrolyte and fluid balance within the cell. Feedback The correct answer is: All of the above have prob [Show More]

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