Which of the following apply to the development of streptomycin resistance in E. coli?Check All That ApplyThe E. coli population has genetic variation.The E. coli population has genetic variation.The selective agent is streptomycin.The selective agent is streptomycin.The mutation resulting in streptomycin resistance is random.The mutation resulting in streptomycin resistance is random.E. coli changes its gene structure to become antobiotic resistant in the presence of streptomycin.
Question
Which of the following apply to the development of streptomycin resistance in E. coli?Check All That ApplyThe E. coli population has genetic variation.The E. coli population has genetic variation.The selective agent is streptomycin.The selective agent is streptomycin.The mutation resulting in streptomycin resistance is random.The mutation resulting in streptomycin resistance is random.E. coli changes its gene structure to become antobiotic resistant in the presence of streptomycin.
Solution
The following statements apply to the development of streptomycin resistance in E. coli:
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The E. coli population has genetic variation: This is true. Genetic variation is a key factor in evolution. In the case of E. coli, some individuals may have a genetic variation that makes them resistant to streptomycin.
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The selective agent is streptomycin: This is also true. Streptomycin is the selective pressure in this scenario. Only those E. coli with the genetic variation that confers resistance to streptomycin will survive and reproduce when exposed to this antibiotic.
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The mutation resulting in streptomycin resistance is random: This is true as well. Mutations occur randomly and are not directed towards a specific outcome. An E. coli bacterium does not mutate to become resistant to streptomycin because it is in an environment containing the antibiotic; rather, the mutation occurred randomly and the environment selects for it because it confers a survival advantage.
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E. coli changes its gene structure to become antibiotic resistant in the presence of streptomycin: This statement is not entirely accurate. E. coli does not actively change its gene structure in response to streptomycin. Instead, a random mutation that confers resistance to streptomycin may occur, and this mutation will be selected for in an environment containing the antibiotic.
Similar Questions
Resistant and nonresistant E. coli bacteria samples were spread on the agar plates below and incubated for 24 hours. The streptomycin negative with resistant E. coli. appears spread throughout the plate.The streptomycin positive with resistant E. coli. appears spread throughout the plate.The streptomycin negative with non-resistant E. coli. appears spread throughout the plate.The streptomycin positive with non-resistant E. coli. appears concentrated at three points on the plate. Select the true statements from the list below.Check All That ApplyThe resistant E. coli strain grows on streptomycin negative plates.The resistant E. coli strain grows on streptomycin negative plates.The nonresistant E. coli strain grows on streptomycin negative plates.The nonresistant E. coli strain grows on streptomycin negative plates.The nonresistant E. coli strain grows the same on streptomycin positive or negative plates.The nonresistant E. coli strain grows the same on streptomycin positive or negative plates.The resistant E. coli strain grows on streptomycin positive plates.The resistant E. coli strain grows on streptomycin positive plates.Both resistant and nonresistant E. coli strain show no growth on streptomycin positive plates.
New alleles that might allow a bacterium to become resistant to an antibiotic arise throughMultiple choice question.mutation.genetic drift.induction by the antibiotic.antibiotic alteration.
Describe what antibiotic resistance is and explain how it develops in a population of bacteria.
How does an antibiotic act as a selective agent in promoting bacterial resistance?Multiple ChoiceAntibiotics are designed to selectively kill some bacteria while promoting the survival of all others.Exposure to a specific antibiotic causes a mutation that allows the affected bacteria to survive and reproduce, passing the mutation to future generations.Bacteria with a random mutation that allows resistance to that antibiotic are able to survive exposure and reproduce, passing the resistance mutation on to subsequent generations of bacteria.A specific antibiotic selects favorable mutations that promote susceptibility to that antibiotic.
If antibiotics are used only for serious infections, what will happen to the rate of development of antibiotic-resistant strains? Will it increase, decrease or stay the same?
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