Bacteria having rDNA containing both tetracycline and kanamycin resistant genes will survive in media with:

Tetracylcine only

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Kanamycin only

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Any antibiotics

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Both kanamycin and tetracycline

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Solution

The correct option is D Both kanamycin and tetracycline
Bacteria having rDNA containing both tetracycline and kanamycin resistant genes will produce enzymes that inactivate both tetracycline and kanamycin. Therefore they can survive in a media which has either kanamycin or tetracycline or both. If there is any other antibiotics present, then the bacteria would not survive.

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