... carry one or more antibiotic resistance genes, which confer resistance to a specific antibiotic to the...to be resistant to the antibiotic. On the second plate, streak out a strain that’s not resistant to the... be resistant to the antibiotic, (+) indicates that the tested strain is supposed to be resistant to the...Negative Result 3: Only the Non-resistant Strain Grows If only the non-resistant strain grows, it’s likely ... carrying them. The presence of an antibiotic resistance gene on a plasmid allows researchers to easily...for the selection of only those bacteria with resistance to that antibiotic - usually conferred by a plasmid... plasmid carrying the antibiotic resistance gene. The following protocol will allow you to make your own...