Why might bacteria use quorum sensing to regulate genes needed for virulence? How might this reason be related to the rationale behind using quorum sensing to establish a symbiotic relationship?
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Why might bacteria use quorum sensing to regulate genes needed for virulence? How might this reason be related to the rationale behind using quorum sensing to establish a symbiotic relationship?
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- How is quorum sensing related to virulence of microorganisms? How does this advances our understanding of microorganisms?How would someone design an experiment to test the role of azithromycin on quorum sensing in Pseudomonas aeruginosa?What is the best explanation for why a bacteriostatic treatment might be chosen over a bacteriocidal treatment? Bacteriostatic treatments will eliminate all bacteria while bacteriocidal treatments will only eliminate a portion of the bacteria. Bacteriostatic treatments typically have lower toxicity to the host when compared to bacteriocidal treatments. Bacteriostatic treatments will prevent all bacterial growth, while bacteriocidal treatments will permit some bacterial growth. Bacteriostatic treatments are typically more costly than bacteriocidal treatments.
- Why is it incorrect to say that bacteria produce toxins to harm their host?Why is biofilm development in catheters (tubes that can be inserted into a body cavity, duct or vessel which allow drainage or injection of fluids) such a dangerous source of infection in hospitals?If a bacterial species is not susceptible to an antibacterial drug at the concentration present in a particular disk, does that necessarily mean the species is completely resistant to the drug? Explain your answer. What is the mode of action of bacitracin? How does this influence the types of bacteria it can be used against effectively? What is the mode of action of tetracycline? How does this influence the types of bacteria it can be used against effectively? Describe how populations of bacteria can evolve resistance to antibiotics. In your description, use the terms/phrases: mutation, resistant, sensitive, individuals, populations, natural selection, horizontal gene transfer.
- In a rapidly changing environment, which bacterial population would likely be more successful: one that has individuals capable of conjugation or one that does not? Explain.As revealed by different colony types, would there be a different species of bacteria/microorganism that can be found in any given environment?What specific essential nutrient is required by a particular species of bacteria to survive and reproduce, and how does the absence of this nutrient impact its growth and survival?
- What is the difference between a bactericidal antibiotic and an antibiotic that is bacteriostatic? Examine the zone of inhibition around each disk for the presence of micro colonies within the zone. What do these micro colonies represent? Why didn't plants evolve anti-microbial agents against all the microbes in their environment?A recent study found that 480 Streptomyces strains freshly isolated from the soil are resistant to at least six different antibiotics. In fact, some isolates are resistant to 20 different antibiotic drugs.Why do you think these bacteria (which are neither pathogenic nor exposed to human use of antibiotics) are resistant to so many drugs? What might be the implications for human bacterial pathogens?what kind of experiment can prove that azithromycin (antibiotics) has has an effect of on Quorum Sensing in Pseudomonas aeruginiosa.