5. Triclosan kills or inhibits *E. coli* growth, so it reduces harmful bacteria on surfaces, making it an effective cleaning agent. 6. No (or very few) living *E. coli* would rema…
a. what characteristic does the variant s bacteria have that allows it to remain on the desktop even after several months of treatment with triclosan?
b. is it likely that the bacteria in the new swab were on the desk 9-months ago, or are they off-spring of the original bacteria?
c. propose an explanation for the presence of only variant s on the desktop after so much time.
read this!
populations of most living organisms exhibit genetic diversity among individuals. certain traits in a population give some organisms a greater chance of survival than individuals that lack these traits. because these traits tend to increase the chance of survival, these individuals may produce more offspring that also have the trait that favors survival. over time, the number of individuals within the population pos-sessing the favorable trait increases while the number of offspring with the favorable trait decreases.
a. what characteristic does the variant s bacteria have that allows it to remain on the desktop even after several months of treatment with triclosan?
b. is it likely that the bacteria in the new swab were on the desk 9-months ago, or are they off-spring of the original bacteria?
c. propose an explanation for the presence of only variant s on the desktop after so much time.
read this!
populations of most living organisms exhibit genetic diversity among individuals. certain traits in a population give some organisms a greater chance of survival than individuals that lack these traits. because these traits tend to increase the chance of survival, these individuals may produce more offspring that also have the trait that favors survival. over time, the number of individuals within the population pos-sessing the favorable trait increases while the number of offspring with the favorable trait decreases.
Triclosan targets and inhibits the growth or kills E. coli (a common harmful bacteria) by disrupting bacterial cell processes, so it works as a cleaning agent to reduce harmful microbial populations on surfaces.
Most living E. coli would not remain, because triclosan is designed to kill or inhibit the growth of this bacteria. However, a small number of resistant variants might survive if present, but the standard effect is elimination of most living E. coli.
Variant S has genetic resistance to triclosan, meaning triclosan cannot kill or inhibit its growth, allowing it to persist on the treated desktop.
They are almost certainly offspring of the original bacteria. Bacteria have short generation times, and 9 months is far too long for individual E. coli to survive continuously on a cleaned surface; the resistant bacteria would have reproduced repeatedly, passing on their triclosan-resistant trait.
This is due to natural selection. The original E. coli population had genetic diversity, including a small number of variant S with triclosan resistance. Repeated triclosan cleaning killed all non-resistant E. coli, while variant S survived, reproduced, and passed on its resistant trait. Over 9 months, variant S became the only type present as it was the only one with a survival advantage in the triclosan-exposed environment.
7a. Variant S has triclosan resistance, so it is not killed by the cleaning agent.
7b. They are offspring of the original bacteria; individual E. coli cannot survive 9 months on a cleaned surface, but resistant variants would reproduce.
7c. Natural selection: Triclosan eliminated non-resistant E. coli, while the resistant variant S survived, reproduced, and became the dominant (only) type over time.
Triclosan targets and inhibits the growth or kills E. coli (a common harmful bacteria) by disrupting bacterial cell processes, so it works as a cleaning agent to reduce harmful microbial populations on surfaces.
Most living E. coli would not remain, because triclosan is designed to kill or inhibit the growth of this bacteria. However, a small number of resistant variants might survive if present, but the standard effect is elimination of most living E. coli.
Variant S has genetic resistance to triclosan, meaning triclosan cannot kill or inhibit its growth, allowing it to persist on the treated desktop.
They are almost certainly offspring of the original bacteria. Bacteria have short generation times, and 9 months is far too long for individual E. coli to survive continuously on a cleaned surface; the resistant bacteria would have reproduced repeatedly, passing on their triclosan-resistant trait.
This is due to natural selection. The original E. coli population had genetic diversity, including a small number of variant S with triclosan resistance. Repeated triclosan cleaning killed all non-resistant E. coli, while variant S survived, reproduced, and passed on its resistant trait. Over 9 months, variant S became the only type present as it was the only one with a survival advantage in the triclosan-exposed environment.
7a. Variant S has triclosan resistance, so it is not killed by the cleaning agent.
7b. They are offspring of the original bacteria; individual E. coli cannot survive 9 months on a cleaned surface, but resistant variants would reproduce.
7c. Natural selection: Triclosan eliminated non-resistant E. coli, while the resistant variant S survived, reproduced, and became the dominant (only) type over time.
5. based on its effect on e.coli, why is triclosan used as a cleaning agent? 6. suppose the desktop swabbed earlier was cleaned with a solution containing triclosan. would living e.coli remain? support your answer. 7. suppose the desktop was swabbed again after cleaning it with triclosan over a 9-month school year. when the sample was cultured only variant s was seen. a. what characteristic does the variant s bacteria have that allows it to remain on the desktop even after several months of treatment with triclosan? b. is it likely that the bacteria in the new swab were on the desk 9-months ago, or are they off-spring of the original bacteria? c. propose an explanation for the presence of only variant s on the desktop after so much time. read this! populations of most living organisms exhibit genetic diversity among individuals. certain traits in a population give some organisms a greater chance of survival than individuals that lack these traits. because these traits tend to increase the chance of survival, these individuals may produce more offspring that also have the trait that favors survival. over time, the number of individuals within the population pos-sessing the favorable trait increases while the number of offspring with the favorable trait decreases.
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