Question

When F-episomic element of a bacterium becomes integrated into its main genophore is called as

• A. F${}^{+}$
• B. F${}^{-}$
• C. HFr
• D. HFr${}^{-}$

Answer 1

The correct option is C HFr

A F${}^{+}$ strain is characterized by presence of fertility factor in addition to its main genophore that make the bacteria a donor in a recombination process. The F${}^{-}$ strain is characterized by absence of fertility factor that make the bacteria a receiver in a recombination process. Recombination in bacteria refers to transfer of piece of donor DNA to the recipient cell that finally become the stable part of recipient’s genome and are termed as HFr (high recombination frequency strains). Presence of F factor makes HFr a donor in recombination process, they are never recipient.

Thus, the correct answer is option C.