Your instructor asks you to explain why the Streptococcus speciesthat are catalase negative are capable of growth in the presence ofoxygen. How would you respond?
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Q: Explain why a green metallic sheen is formed when E. coli is grown on Eosin Methylene Blue Agar.
A: Escherichia coli is the gram negative bacteria.
Q: Account for the ability of streptococci to tolerate O2 in the absenceof catalase activity
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Q: holsappleeus scarius is a normal flora of the human intestenal tract. its facultative anaerobe…
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Q: If Clostridium botulinum is an anaerobe, how might botulinum toxin get into food?
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A: Oxidase test is used to determine the presence of cytochrome c by a bacterium. This test belongs to…
Q: describe the type of growth if E. coli is also allowed to grow in a medium containing glucose…
A: To describe The type of growth if E. coli is also allowed to grow in a medium containing glucose…
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Q: If you are working at a sewage treatment plant, which microbial process would you use to reduce…
A: denitrification;to reduce HAB's.
Q: Gram negative bacteria lose crystal violet colour after alcohol treatment because of: Select one: a.…
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Q: Explain why sulfa drugs prevent bacterial growth without harming the human host.
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Q: Which of the letter labeled microbes is exhibiting alpha-hemolysis?
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Q: How would you interpret the hemolytic reaction on this SBA plat
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A: true
Q: Where will a bacterium (eg E. coli) grow best: glucose, malonate, or gluconate? Explain your answer.
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Q: All of the following microorganisms contains the enzyme catalase except?
A: Answer - Option D - Obligate anaerobes
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Q: Why does hydrogen peroxide are most effective against probiotics?
A: Hydrogen peroxide is a peroxide. It acts as an oxidizing agent
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A: Gram-negative bacteria are surrounded by a thin peptidoglycan cell wall, and an outer cell membrane…
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A: Bacteria are organisms that are found almost everywhere on earth and are free-living cells that are…
Q: Where will a bacterium (e.g., E. coli) grow best: glucose, malonate, or gluconate?
A: Introduction Escherichia coli, also known as E. coli, is a Gram-negative, facultatively anaerobic,…
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Q: Why would you not expect an obligate aerobe to have a fermentative pathway?
A: Fermentation is a metabolic process that produces chemical changes in organic substrates through the…
Your instructor asks you to explain why the Streptococcus species
that are catalase negative are capable of growth in the presence of
oxygen. How would you respond?
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- you grew streak plates of Clostridium sporogenes under both aerobic and anaerobic conditions. Which plates showed bacterial growth, and what does the zone around the metronidazole disc represent? Additionally, explain what types of bacterial growth metronidazole affects and why.Flasks A and B contain broth, and are inoculated with an identical number of bacteria that are facultative anaerobes. Flask A contains a triglyceride lipid as the sole nutrient source, and Flask B contains a monosaccharide called fructose as the sole nutrient source. Both flasks are incubated at 30°C with aeration (oxygen is added to the broth). Assume the bacteria are capable of catabolism of both fructose and triglycerides. Mark all the correct statements pertaining to these cultures. A. Under anaerobic conditions, cells in flask A will produce more ATP B. Cells from flask B will produce more carbon dioxide C. Cells from flask B will produce more ATP D. Flask A will have the greater cell mass E. Cells from flask A will produce more ATP F. Cells from flask A will produce more carbon dioxide G. Flask B will have the greater cell mass H. Under anaerobic conditions, cells in flask B will produce more ATPWhy might clinical medicine have an interest in understanding bacterial cell division at the molecular level? Explain why a hyperthermophile would probably not be a human pathogen. Describe four factors that may have an influence on the effectiveness of an antimicrobial treatment. Explain why 70% or 80% alcohol is more effective than 100% alcohol in controlling microorganisms.
- Nitrate reduction test can be used to differentiate between Pseudomonads and Enterobacteriaceae. You inoculated your Nitrate broth with your unknown; after incubation, you added 5 drops of reagent A and 5 drops of reagent B. You observe a red color within 2 minutes. Is this a + or a - reaction? Assuming you did not get a red color, you then added a pinch of Zinc and this time tou obtained a red color. What does this mean?clostridium botulinum is a bacterium usually present in soil that may cause botulism. Briefly explain why one or few cells of a pathogenic bacterium, such as clostridium botulism, by itself typically does not secrete a toxin, despite the species as a whole being characterized as toxin producing.Explain why sulfa drugs prevent bacterial growth without harming the human host.
- A chemolithoautotroph is respiring using only iron (Fe3+) and nitrite (NO2-). This bacterium does not consume organic molecules. . Describe one possible problem that may occur if this organism grows in the presence of oxygenErysipelothrix rhusiopathiae is a gram positive bacilli that survives in water contaminated by a sick animal’s feces or urine, soil, or plant material. It is known for causing zoonoses, and is typically associated with occupational exposure to animals. There are a few tests commonly used that help to differentiate the organism. Indicate the results for the following reactions: Catalase: TSI: Growth in gelatin:A batch of turkey rolls (10 lb—approximately 4.5 Kg—each) were cooked to 165°F internal temperature in bags, opened, sliced, vacuum-packaged, and stored at 40°F. The product was expected to have a refrigerated shelf life of 50 days. However, after 40 days, the packages contained gas and approximately 107 bacterial cells/g of meat. The bacterial species involved in the spoilage was found to be Leuconostoc carnosum, which is killed at 165°F. What could be the sources of the bacterial species in this cooked product?
- Clostridium tetani is a common soil bacterium and causes tetanus. Would you expect C. tetani to possess the enzyme catalase? Explain.Menaquinones is produced by Flavobacterium meningosepticum via submerged fermentation with 60% working volume in 30-L fermentation. To obtain the crude menaquinones, the fermentation medium is centrifuged at 12,000 rpm for 15 minutes. The vacuum-freeze dried particles are crushed and collected. After that the samples are treated with methanol for 20 minutes. To remove polar lipid compounds from bacterial cells, HZ816 macroporous adsorption resin column is used with methanol-dichloromethane (l:1) as mobile phase and flow rate of 0.75 mL/min. Rotary evaporation at 500 C is carried out to concentrate the eluent. After that, the concentrated sample is purified with Bio-BeadsTM S-X3 to remove components without UV absorption. To obtain the homolog purified menaquinones, RP-C18 column is used. Recrystallization is carried out to obtain pure crystalized menaquinones. Answer the following: Indicate how to obtain the sample in the methanol solvent. Three different chromatography are used in…holsappleeus scarius is a normal flora of the human intestenal tract. its facultative anaerobe capable of catabolizing carbohydrates. which conditions will give them the most growth?