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Do all bacteria contain a plasmid?

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A plasmid is a small, circular, double-stranded DNA molecule that is distinct from a cell's chromosomal DNA. Plasmids naturally exist in bacterial cells, and they also occur in some eukaryotes. Often, the genes carried in plasmids provide bacteria with genetic advantages, such as antibiotic resistance. read more

The DNA necessary for bacterial life is usually in the chromosomal DNA. The plasmid DNA may confer benefits but the function of most plasmid DNA is currently unknown. Scientists have selected for plasmid free bacteria, and plasmid-free strains, especially E. coli, are available commercially. read more

Best Answer: plasmid - circular piece of DNA. Bacteria use them to allow for exchanging DNA. SO for example if a bacteria infected a person it would use the plasmid by injecting it into host cells where it replicates. Plasmids are really important because we can use them to our advantage. read more

In contrast, virtually all biotechnologically used plasmids (such as pUC18, pBR322 and derived vectors) do not contain toxin-antitoxin addiction systems and thus need to be kept under antibiotic pressure to avoid plasmid loss. Yeast plasmids. Yeasts naturally harbour various plasmids. read more

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