A. In E.coli, a natural closed DNA that is negatively supercoiled.

B. The intercalation of ethidium bromide first removes the negative supercoils and then introduces positive supercoils.

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#Question id: 12610

#Unit 10. Ecological Principles

If the Sun were to suddenly stop providing energy to Earth, most ecosystems would vanish. Which of the following ecosystems would likely survive the longest after this hypothetical disaster?

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#Question id: 4362

#Unit 3. Fundamental Processes

How are bacteria able to change their patterns of protein synthesis so quickly in response to environmental changes?

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#Question id: 30084

#Unit 2. Cellular Organization

Drosophila is considered a model system because it is quite easy to create transgenic lines harboring a variety of different genes. As a Drosophila geneticist, which one of the following is a DNA transposon that you would exploit to create a transgenic line?

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#Question id: 18927

#Unit 13. Methods in Biology

Which of the following statements, if any, is false?

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#Question id: 15884

#Unit 12. Applied Biology

Laminar airflow is used for the following reason except;