Why is it important to have an antibiotic resistance gene in the cloning plasmid?

Question

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A) The antibiotic resistance gene in a cloning plasmid allows researchers to apply an antibiotic to a culture of bacteria. Only the bacteria that have successfully taken up the plasmid (which includes the antibiotic resistance gene) will survive, thus enabling the researchers to distinguish these from those that did not take up the plasmid.

Why Is It Important to Have an Antibiotic Resistance Gene