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- Besides dehydrated foods, how might the amount of water available to microbes be decreased? Group of answer choices Treatment by non-ionizing radiation. Treatment at high pressures for extended periods of time. Storage at temperatures between -2 and 4 °C. Pasteurization Addition of solutes such as salt or sugar.When food leftovers are stored in a refrigerator, how does this help prevent food borne illnesses? Group of answer choices Low temperatures deactivate any toxins that might be produced by microbes. Low temperatures inhibit the metabolism and growth of microbes. Low temperatures disrupt microbe membranes and kill any microbes that are present. Low temperatures prevent microbes from forming biofilms.Refrigerated milk can spoil due to microbial growth. Do these microbes typically cause disease in humans? Consider the environment in your body and the environment in which the microbes are growing.
- Which of the following types of bacteria can contaminate water sources in hospitals and also cause pulmonary diseases or infections? Question 9 options: Mycobacterium spp. Hydrobacterium spp. Escherichia coli Shigella spp.What is minimum amount of time one much wash his or her hard to kill microbes? A. 1 second B.60 seconds C.20 seconds D. 10 secondsIn thinking about thermal death curves. Assume D50=10min. How long does it take to kill 90% of the cells? How long would it take you to sterilize a culture that had 10^5 bacteria in it? Select one: a.50 min / 500 min b.10 min / 50 min c.None of the Above d.50 min / 60 min e.10 min / 60 min
- Which statement is NOT a concept in microbes present in animals? A. Each individual animal has its unique set of microbial flora. B. There are normal microbial flora present in key parts of an animal. C. Personal hygiene and decontamination can remove all microbes in an animal. D. Some microbes are incidental and transient.Use this graph showing the standard death curves of three microbial species to answer the following two questions. The three microbial species shown in the graph where all treated at 70° C. If you had to sterilize a food product that contained 107 bacteria, how long would it take for each bacterial species? Calculate the D70 values for these three bacterial populations. For the next three questions, assume D90 = 22 minutes. At what temperature will you treat a food product? How long does it take you to kill 90% of bacteria? How long will it take you to sterilize a food product if it had 109 bacteria on it? Serial Dilutions 6a. A sample is given to you that contains 6 million cells per ml. You must make a series of serial dilutions in order to get a countable number on a plate to prove that there are indeed 6 million cells per ml. The plate that you eventually put a sample of bacteria on must have between 10 and 100 colonies for ease of counting. What…If a bacteria was found to survive very well in a pond of strong acid, but died quickly when exposed to air, this bacteria may be considered....? Aerobic Anaerobic Pathogenic E. coli
- A microorganism found living under conditions of high ________ is a barophile. carbon dioxide levels hydrostatic pressure salt concentrations oxygen concentrations pH valuesWhich of the following prevented an aerotolerant anaerobic, mesophilic and halophilic bacterium from contaminating your home aquarium? the water was at 37ºC you placed a high amount of glucose into the aquarium you placed several pennies in the aquarium you were using a .45 um filtering unit you placed carbon dioxide instead of oxygen into the aquariumImagine you are a doctor treating a patient with a skin infection caused by a facultative anaerobic bacteria. You have tried several rounds of topical antibiotics, but the infection keeps returning. One of your interns suggests that you try hyperbaric chamber treatment – how would you respond? 1. “Hyperbaric chamber treatment might work because these bacteria won’t be able to obtain energy under low-oxygen conditions. Let’s give it a shot.” 2. “Hyperbaric chamber treatment won’t work because these bacteria can undergo anaerobic fermentation when oxygen levels are low. I’m prescribing oral antibiotics.” 3. “Hyperbaric chamber treatment won’t work because these bacteria can undergo aerobic respiration when oxygen is abundant. I’m going to prescribe oral antibiotics.” 4. “Hyperbaric chamber treatment might work because these bacteria won’t be able to obtain energy under high-oxygen conditions. Let’s give it a shot.”