When cells are cultured on selective media, it makes plasmid-containing bacteria easy to identify and puts pressure on those bacteria to retain their plasmid.
Antibiotics are commonly thought of as substances that either kill or stop the growth of microorganisms. Although they were first derived from natural substances, many of the popular antibiotics used in laboratories today are made of partially or entirely synthetic substances. Antibiotics can be categorised according to whether they directly kill bacteria (bactericidal) or slow growth/prevent cell division (bacteriostatic); however, the line separating the two classifications may be a little blurry because some bacteriostatic reagents can kill bacteria when used at high concentrations (and vice versa). Numerous of the plasmid listed in the table below are probably present if you take a look around the lab.
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