Plasmid is an extrachromosomal (it is not part of the main strain structure; it is an outlying element) genetic element that occurs in many bacterial strains. It replicates independently of the bacteria but still has a relationship with the strain in that it can create proteins that are antibiotic which will kill other bacteria. It also can make the strain immune to antibiotic. Plasmid can transfer cells and establish itself in an entire population of bacteria.
Plasmids are DNA molecules usually found in bacteria cells. They aren’t an essential part, and not all have them, but different plasmids can provide the bacterium with special abilities, like being reistant to antibiotics. Plasmids are used in cloning because they can pass between cells easily and can easily make copies of itself in other cells.
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