An R-plasmid was found in a strain of Salmonella typhi that conferred resistance to a β-lactam antibiotic.Most likely,this plasmid contained a gene that encoded for a/an …

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The fact that the R-plasmid confers resistance to a β-lactam antibiotic suggests that it contains a gene for β-lactamase, an enzyme that breaks down and inactivates β-lactam antibiotics.

An R-Plasmid Was Found in a Strain of Salmonella Typhi