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F-negative bacterium

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noun, plural: F- bacteria

The bacterial strain that does not contain F factor.


F- bacterium serves as the recipient cell of F factor from a bacterium that has it. A copy of F factor is transferred to the F- bacterium through conjugation. The result following conjugation becomes F+ and thereby acquires the ability to form sex pilus essential in initiating conjugation with other bacteria. The now F+ cell becomes a potential donor of F factor to other bacteria.


  • F- bacterium

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

See also: