List multiple reasons why preventing the growth of certain microbes is necessary/valuable 2. For bacterial growth, what can we do to compose a continuous culture where we would get continuous supply of the product? 3. Antibiotics - How did we compose major issues for treatment through resistance built up from the antibiotics?

List multiple reasons why preventing the growth of certain microbes is necessary/valuable 2. For bacterial growth, what can we do to compose a continuous culture where we would get continuous supply of the product? 3. Antibiotics - How did we compose major issues for treatment through resistance built up from the antibiotics?

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter26: Prokaryotes: Bacteria And Archaea

Section: Chapter Questions

Problem 8TYK

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1. it is sometimes difficult to obtain pure cultures of microbes that grow naturally in mixed communities. True or False ? 2. Some antibiotics fail to kill/inhibit a pathogen simply because the microbe is naturally (intrinsically) resistant to it. True or False? 3.Which of the following medications inhibits bacterial cell wall synthesis? PenicillinPenicillin VancomycinVancomycin TetracyclineTetracycline BacitracinBacitracin Chloramphenicol 4. Identify the two major mechanisms by which microbes can acquire resistance to antimicrobial medications. Spontaneous mutation Spontaneous mutation Binary fission Binary fission Gene transfer Gene transfer Medication overuse Medication overuse Spontaneous mutation and binary fission 5. Differential media only allow certain bacteria to grow. True or False?
1. How is UV radiation a good type of control mechanism against microbial growth? Please explain what happens to the microbe and effects this control causes. 2. Suppose you do the Kirby-Bauer test on a hypothetical Staphylococcus species with penicillin and tetracycline. You record diameters of 20mm for tetracycline and 24mm for penicillin. Which antibiotic is most effective against this bacterium and why? Please explain and interpret these results. 3. Please provide the scientific name of your microbe that was used in the UV experiment (i.e. S. aureus). Compare your plates and interpret/analyze your results. Please discuss your findings and any patterns you were able to gather. 4. After performing the “Effects of Antiseptics & Disinfectants” lab which agent(s) showed potential to control S. marcescens growth? P. aeruginosa? Please explain why you believe these agent(s) work. 5. What purpose does water serve in the “Effects of Antiseptics & Disinfectants” lab? What did you…
1. How is UV radiation a good type of control mechanism against microbial growth? Please explain what happens to the microbe and effects this control causes. 2. Suppose you do the Kirby-Bauer test on a hypothetical Staphylococcus species with penicillin and tetracycline. You record diameters of 20mm for tetracycline and 24mm for penicillin. Which antibiotic is most effective against this bacterium and why? Please explain and interpret these results.
1. What kinds of media would be used to culture and Identify this microbe?2. What are some other potential microbes that could have this infection?
1.What advantage(s) does the pour plate method have over the streak-plate method? 2.Why is the loop flamed before it is placed in a culture tube? Why is it flamed after completing the inoculation? 3.Before inoculating and pouring molten nutrient agar into a plate, why must the agar first be cooled to 50° C? 4.Explain why plates should be inverted during incubation. 5.Explain why plates should be inverted during incubation.
2. You use tubes to test aerotolerance of bacteria. From your samples you have 3 results: A. Bacteria growing on the surface. B. Bacteria growing throughout the tube, the agar shows cracks. C. Bacteria growing about 5 mm below the surface. Please interpret each bacterial result. (Give the bacteria an oxygen classification, explain what classification means and interpret the cracks in the agar.) 3. Please explain how the use of an Eosin Methylene Blue Agar plate can help determine the type of fermenters that bacteria are. Please explain thoroughly.
1. Table 1 lists a typical recipe for growing bacteria in the lab. A researcher discovered a potentially new species of bacterium from a soil sample and attempted to grow it in this media. Unfortunately, the bacterium did not grow. Identify at least three components that you suggest adding to the medium to enable growth. Provide a reason for adding each component. Table 1. per 1000 mL 1g Bacteria culture media NazHPO4•7H2O KH2PO4 3g 5 g 1 g 0.4% (wt/vol) 0.2% (wt/vol) NaCl NHẠC1 Glucose Casamino acids
2. What of the following types of culture media allows the growth of specific microorganisms and suppresses the growth of other microorganisms? A. Selective B. Non-selective C. Enriched D. Differential E. None of the above
2. A mannitol-salt agar plate was inoculated with these bacteria and is shown below. A. What type of organisms grow on this medium? B. Based on the reaction below, what can you say about the organism derived from the patient's abscess?
1. In terms of counting cells, what does a plating method accomplish that an electronic cell counting method does not? 2. Why does turbidity lose reliability at high cell concentrations when the culture reaches the stationary phase? 3. Some hyperthermophiles can survive autoclaving temperatures. Are they a concern in health care?
1. What is the purpose of adding mineral oil to an O/F Media tube and why do we only put mineral oil in only one? 2. Which sugars are typically tested in the phenol red broth? Can the phenol red test be also used to determine if a certain bacterium can metabolize various carbohydrates? 3. Explain how conducting the MR/VP test too soon in a culture's growth cycle can lead to false negatives? 4. Generally, the color change we see in these tests is a result of what change in the media? Explain. 5. How does the production of urease acid aid Helicabactor. pylori ability to live in the stomach?
1. What substance is produced by a microorganism that is capable of the growth of other microorganisms? Give a concrete example of your answer. 2. In what way does the use of antibiotics contribute to the problem of the emergence of drug-resistant microorganisms? 3. What does the zone of inhibition imply? Does the measurement of the zone of inhibition imply that one antibiotic is better than the other? Support your answer.