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- What is a biofilm? Give an example of a biofilm that is beneficial to humans and one that is harmful.11. This bacterium can be both helpful in our lower digestive tract and harmful to our upper digestive tract. Spirilla O Methanogens E. Coli Halophiles httpold Googihave prote 3. Describe the formation of biofilms and their potential for causing infection. Identify a way in which pathogens find it advantageous to form biofilms. Explain the importance of biofilms to infection. Explain 4 approaches to preventing or limiting biofilms. 4. Compare heterotrophy, autotrophy, phototrophy, and chemotrophic (lithotrophy and
- 5. I need quickly. Among these five sampled areas of the body: fingers, ears, hair, mouth, and nose, which is expected to have the most number of microorganisms and which among these body parts may contain potentially pathogenic microbes? Provide an explanation.15. Following are differences between the tetanus and botulism EXCEPT ( identify the false statement !!!) Group of answer choices tetanus toxin inhibits GABA release in contrast to Ac choline by botulism tetanus toxin is used for cosmetic and medicinal use ( migraine treatment ) tetanus could be initiated by puncture wound (rusty nail ) while botulism can be due to ingestion of contaminated food ( like honey contaminated with spores) tetanus toxin leads to spastic paralysis while botulism leads to flaccid paralysis botulism vaccine is not part of routine vaccination unlike tetanus ( DTaP) 16. During nutrient uptake in an bacterial cell, altering a substance / chemical modification to prevent it from leaving is best described as, Group of answer choices downhill process; energy independent none of the above simple diffusion group translocation facilitated diffusion3. You plate 3 different strains of the bacteria family Aspergillis on a MacConkey Agar plate. You notice that 2 have a yellow shade, 1 has a subtle pink color. Please interpret this information. Such as, the type of fermenters these bacteria are and what this says about their metabolism.
- 3- Visible Growth in Tubes Growth in Petri Dishes 0 µg/ml 2 µg/ml 0 1 3 4 ÖÖÖÖÖÖÖÖ 2 5 6 7 number 1, and After addition of The figure given above summarizes an experiment carried out to test the efficacy of an antimicrobial substance. In the tube number 0, no antimicrobial substance was added into bacterial culture. 2 µg/ml of antimicrobial substance was added into tube the amount of antimicrobial was doubled for each consecutive tube. antimicrobial into tubes, tubes were incubated for overnight and after incubation tubes were observed for growth. The growth status of bacteria in each tube was shown as (+) and (-). In addition to observation of visible growth, 1 ml of sample from each tube was collected and plated into petri dishes and incubated for additional overnight. Similarly, the growth status in petri dishes was as (+) and (-). According to given information; a. Determine the minimum inhibitory concentration (MIC). b. Determine the minimum bactericidal concentration (MBC). c.…2,It is mentioned that although streptomycetes contain many molecules with antimicrobial activity, very few are commercialized. Can you provide examples of some of the molecules that are commercialized and some that are not commercialized?4. Why does turbidity lose reliability at high cell concentrations when the culture reaches the stationary phase? 5. Some hyperthermophiles can survive autoclaving temperatures. Are they a concern in health care? 6. People who use proton pumps inhibitors or antacids are more prone to infections of the gastrointestinal tract. Can you explain the observation considering what you have learned?
- How does the skin function to protect the body from microbes? Multiple Choice It serves as an impenetrable barrier most places except on the soles of the feet where the skin is particularly thin. Sweat serves to help flush microbes away. It secretes lysozyme which has antibacterial properties. It serves as an impenetrable barrier due to layers of keratin infused cells. search a3. Why is hydrogen peroxide so effective against anaerobes like Clostridium tetani that have infected a puncture wound? Make sure to explain what an anaerobe is as well as the action of hydrogen peroxide in your answer.Day Care Center outbreak: Salmonellosis You just finished identifying the fecal contaminated food at the first restaurant when you learn there is an outbreak of Salmonella-food poisoning at a day care center, You sample food from the Center's refrigerator and are worried that the egg salad or chicken salad or peanut butter used to make sandwiches may be contaminated with Salmonella. You know Salmonella cannot ferment lactose and it can make hydrgoen sulfide. The strain associated with the outbreak cannot ferment sucrose but can ferment glucose. You isolate in pure culture bacteria from each of the suspect foods and inoculate each into TSI slants. (see results below) egg salad microbe chicken salad microbe peanut butter microbe TSI TSI TSI W FWS
