E.coli Strains That are Hfr

Question

E.coli strains that are Hfr
A)are easily mutated.
B)are susceptible to infection by bacteriophage.
C)contain the F factor integrated in the bacterial chromosome.
D)cannot be made competent.
E)have a low frequency of recombination.

Accepted Answer

Hfr stands for high frequency of recombination and refers to a strain of E. coli where the F factor is integrated into the chromosome. This results in the ability to transfer large portions of the chromosome to a recipient cell during conjugation, leading to a high frequency of recombination. Hfr strains are not necessarily easily mutated, susceptible to bacteriophage, unable to be made competent or have a low frequency of recombination.