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- A bacteria colony's radius is measured as a function of time. t r(t) 0 1.01 0.1 1.031 Estimate the rate of growth Ar/At at t = 0.1 Give two digits past the decimal point. 0.2 1.052 0.3 1.074 0.4 1.096The graph represents the growth rates of different types of bacteria labeled w-z at different temperatures. -10 0 10 20 30 40 50 60 70 80 90 100 110 Temperature (°C) Lactic acid bacteria are type x. They are used in the preparation of fermented food products. What will be the impact on the lactic acid bacteria when the temperature is increased to 60°C? O These bacteria will become type y. O These bacteria will work more effectively. O These bacteria will work at the same speed. O These bacteria will stop fermenting food. Growth Rate of Bacteriaschema __ illustrates simple segragation. shema__illustrates how interpersion is violated during oven incubations schema___has randomization but poor interspersion
- Bacteria can grow under a variety of conditions but also have growth preferences. Bacteria that prefer to grow under oxygen levels that are below that of atmospheric oxygen are called: Obligate aerobes Microaerophiles Anaerobes Facultative anaerobes Clear my selectionBiofilms are often formed on artificial surfaces in the human body. During medical procedures, when artificial joints, intravenous catheters, urinary catheters are placed and injections are made, commensals/mutualists may be introduced into new sites in the body and there they may form biofilms. Which statement below is NOT a reason to explain why such bacteria living in biofilms are so difficult to eliminate? O layers of biofilm prevent phagocytes from killing bacteria O layers of biofilm acts a a diffusion barrier against antibiotics O biofilm stimulates bacteria to grow continually in the log/exponential phase of growth O layers of biofilm acts a a diffusion barrier against antibodies/immunoglobulins O bacteria often in stationary phase of growthA sample of raw ground beef initially contained 25 E. Coli bacteria. After six hours, there are 102 400 cells in the sample. What is the growth rate of the E. coli population? Show all work. Express your answer using scientific notation in the form of xyz 10 d #bacteria/hr.
- The generation time of a bacterial culture that produces two generations per hour is: a. Equal to that produces three generations per hour bLesser than that produces five generations per hour than that produces three generations per hour Lesser than that produces four generations per hour Greater than that produces three generations per hourWhich of the following is the best definition of the word extremophile? bacteria that can withstand very acidic conditions bacteria that can withstand very salty conditions archaea that can withstand temperatures over 120°C bacteria that are able to live in extreme conditionsBacterial growth depends on many environmental factors, including the temperature of the environment. Since microbes can survive in a certain range of temperatures and will thrive at a temperature, understanding these variables allows for control of their growth. This understanding can be used, for example, to preserve certain foods or to treat infections. This lab simulation will use an instrument called a spectrophotometer. This instrument quantitatively measures the amount of light that is absorbed or transmitted by molecules in solution. Microbial populations grow at different rates based on temperature. One way to measure growth is by turbidity measurements. When bacteria multiply in a broth culture they turn the clear solution cloudy, or turbid. a) in your own words explain the proper steps to Inoculate 5°C sterile broth tube using aseptic technique
- A SAB agar plate is exposed to air for 30 minutes and then incubated. The 10 colonies which grew on SAB plate are most likely both yeast and mold colonies yeast colonies only bacterial colonies only fungal, bacterial, and protozoal coloniesTaking microbial cells out of a stationary phase culture and putting them into a fresh, sterile medium (in which they can grow) will result in the cells entering which stage of the growth cycle? Death phase O Log phase Lag phase Stationary phaseSuppose you spilled two cultures of Salmonella typhimur-ium (each containing 100,000 cells) on your lab bench. You im-mediately applied the same disinfectant to both cultures at thesame time. One culture had been freshly grown for 36 hours andthe other culture is 2 weeks old. If the kill ing rate of the disin-fectant is 90% per minute, do you think that microbes in bothcultures will be completely killed after 6 minutes? Why or whynot?