How are antibiotic resistance genes used in biotechnology?

Question

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Antibiotic resistance genes can be used as marker genes in biotechnology to select for cells that have taken up a new gene of interest. This is done by including the antibiotic-resistant gene on the same plasmid as the gene of interest and then exposing the cells to the antibiotic. Only cells that have successfully taken up the plasmid (and thus the antibiotic resistance gene) will survive.

How Are Antibiotic Resistance Genes Used in Biotechnology