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You isolate a pathogenic strain of E. coli from a patient and discover that this E.coli strain is resistant to an antibiotic. Common laboratory strains of E. coli arenot resistant to this antibiotic, nor are any other previously isolated pathogenic E.coli strains. However, such resistance has been observed in other bacteria in thehospital in which the patient was treated. This newly discovered antibioticresistance in E. coli is most likely due to _______.(a) a mutation within a gene.(b) a mutation within the regulatory DNA of a gene.(c) gene duplication.(d) horizontal gene transfer.
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