F-prime bacterium

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noun, plural: F' bacteria

The bacterium possessing a plasmid containing the F factor and a part of the bacterial genome.


There are instances when the F factor incorporated in the chromosome of the Hfr bacterium loops out and becomes a plasmid. In certain cases, the looped-out plasmid not only contains F factor DNA but also a portion of the bacterial chromosome. This occurs when the excision from the chromosome is erroneous.


  • F' bacterium

Compare (with other groups of bacteria in terms of F factor):

See also: