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- Look at the following Growth/Kill curves. The image on the left is what it would look like if a _____________ drug was used, and on the right it is an image of when a ____________ drug was used. Select one: a.Bacteriocidal / Bacteriostatic b.Bacteriolytic / Bacteriocidal c.None of the Above d.Bacteriostatic / BacteriolyticChoose the combination of answers that most accurately completes the statement.Microbial resistance to drugs is acquired through a. conjugation c. transduction b. transformation d. all of these_________4. It is a bacterial that contains plasmid use to produce desirable proteins for human consumptions A. Bacillus thuringiensis B. E. coli C. Saccharomycetes cerevisiae
- Some strains of Escherichia coli bacteria have acquired the ability to produce the harmful Shiga toxin, normally produced by Shigella dysenteriae. Which statements best explain why this occurs? Mark all that apply. A. conjugation between two different species of bacteria allowed both strains of bacteria to express a virulence factor B. transformation resulted in expression of a virulence factor C. horizontal gene transfer between different species of bacteria D. transduction of a specific gene resulted in expression of new traitsDuring this outbreak, some people sickened with listeriosis testedpositive for Listeria monocytogenes in their bloodstream, but a DNAprofile of the bacterium showed that it was not the outbreak strain.What likely conclusion can be drawn from this information?a. It is a false positive. b. The person is not part of the outbreak.c. Listeria monocytogenes mutates frequently, making DNAprofiling unreliable.d. The person has already begun to recover from the disease.Technically speaking, true antibiotics are drugs… A. Produced naturally by microbes B. Taken orally, not injected. C. Used to treat any microbial infection D. Used to treat any bacterial disease.
- Choose the combination of answers that most accurately completes the statement. Which genetic material could be transmitted naturally by all three methods of intermicrobial transfer? a. an E. coli chromosome d. a and c b. F factor e. all of these c. drug resistance genesAntibiotic resistant bacteria are commonly found in hospitals. Why do you think that is?A researcher wants to compare the pathogenicity of a mutant pathogen relative to wild type in an animal model. The mutant is marked with the constitutive expression of a foc gene that turns colonies blue on X-gal agar. The input ratio of the experiment Dilue/white colonies) was 10:1. The output ratio of the infection experiment tant to d type was 1-100 a. What is the CI? Show your work. 1. Define the Cr and describe what it measures in your answer Which of these genotypes does better during infection, the mutant or the wild-type?
- The contents of a plaque may not always contain a clonal population of phage if: a. Identical phages from a neighboring plaque diffuse into the original plaque b. The bacteria run out of resources too quickly and limit phage growth c. Different phages from a neighboring plaque diffuse into the original plaque d. All plaques on the plate originated from a pure phage cultureKatelyn had been working for Dr. Johnson for a month, and while she had become quite good at measuring inhibitionzones, she didn’t know why she was doing all this work. She had gotten very curious after she began doing all themeasurements on a new set of antibiotics. # is experiment involved infecting mice with MRSA and tracking how theMRSA grew over time.Data were collected by counting the cells of MRSA taken from $ uid samples from the mice. # e cells were measuredby taking one gram of the $ uid and spreading it over plates, but now Katelyn counted the colonies that grew on theplate after 24 hours. Because there were so many, she actually measured the colonies as “log CFU/g.” A CFU is acolony forming unit, or essentially a cell that will divide into a colony that can be seen. Because there can be so many,Katelyn measured them on a logarithmic (log) scale. # e raw data in her lab notebook looked like the following:Table 1. E% ect of treatment on MRSA in mice after 24 hours of drug…Which genetic material could be transmitted naturally by all threemethods of intermicrobial transfer?a. an E. coli chromosomeb. F factorc. drug resistance genesd. a and ce. all of these