Describing Bacterial Conjugation: Changing from F- to F+

Which of the following matings is most likely to result in a change from F- to F+?

A) donor F recipient Hfr

B) donor Hfr recipient F+

C) donor Hfr recipient F

D) donor F+ recipient F

E) donor F recipient F+

Answer:

The most likely mating to result in a change from F- to F+ is B) donor Hfr recipient F+.

Bacterial conjugation is an exciting process that allows for the transfer of genetic material between bacterial cells. In order to change from F- to F+, the recipient cell must receive the F factor from the donor cell. This transfer occurs during conjugation, where the donor cell passes on its genetic material to the recipient cell.

A donor Hfr mating is the most likely scenario to result in this change. In an Hfr mating, the donor cell has the F factor integrated into its own chromosome. When this donor cell conjugates with a recipient cell, a portion of its chromosome, potentially including the F factor, is transferred to the recipient cell. This results in the recipient cell becoming F+ and acquiring the ability to transfer genetic material to other cells.

Therefore, the key to changing from F- to F+ lies in the donor cell with a high frequency of recombination (Hfr) and the successful transfer of the F factor to the recipient cell. Bacterial conjugation offers a fascinating glimpse into the world of genetic exchange among bacteria, showcasing the complexity and diversity of microbial interactions.