drk1980
Forum Guru
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Bacterial strain X is resistant to ampicillin and sensitive to gentamicin. Bacterial strain Y is resistant to gentamicin and sensitive to ampicillin. Bacterial strains X and Y are grown in mixed culture in medium without antibiotics, then the culture is plated on medium containing both ampicillin and gentamicin. Bacterial colonies grow on the plates. In a second experiment, DNase is added to the mixed culture medium. When this mixed culture is plated on medium containing both antibiotics, no colonies grow. Assuming that bacterial cells are impermeable to DNase, which of the following processes best explains these observations?
A. Conjugation
B. Mutation
C. Transduction
D. Transformation
E. Transposition
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| robin082006
Forum Hero
Topics: 471
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Drug resistance is inhibited by DNase---> I go with D because transformation is related to DNA fragments.
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| zyf9
Forum Newbie
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Posts: 2
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only transformation is nake DNA,it's D
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| drk1980
Forum Guru
Topics: 147
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Is there any significance to this statement- 'Assuming that bacterial cells are impermeable to DNase'???
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| sugandhna
Forum Newbie
Topics: 1
Posts: 21
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D definitely
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