Which antibiotic would you use to determine if the recombinant dna was taken in? insulin?

The antibiotic that would be used to determine whether the recombinant DNA was taken in includes; kenamycin, ampicillin, and tetracycline. Recombinant DNA results from incorporation of the new DNA information into their metabolism. Host bacteria are normally killed by the mentioned antibiotics. If the recombinant plasmids were taken up by the bacteria, plasmids may have contained a DNA gene for resisting the effects of one or more antibiotics. 

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The answer is constant.