Question

Describing bacterial conjugation, 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 FD)
D) donor F+ recipient F
E) donor F recipient F+

Answer 1

Bacterial conjugation involves the transfer of genetic material between bacterial cells. To change from F- to F+, the recipient cell must receive the F factor from the donor cell. A donor Hfr mating is most likely to result in this change.

Step-by-step explanation:

In bacterial conjugation, the transfer of genetic material occurs between a donor bacterial cell and a recipient cell. The donor cell contains a fertility factor (F factor) that allows it to transfer genetic material to the recipient cell. The F factor can exist in two forms: F+ (donor cell has the F factor) and F- (donor cell lacks the F factor).

To change from F- to F+, the recipient cell must receive the F factor from the donor cell. A donor cell with a high frequency of recombination (Hfr) is most likely to result in this change. In an Hfr mating, the donor cell has the F factor integrated into its own chromosome. During conjugation, a portion of the donor's chromosome is transferred to the recipient cell, potentially including the F factor, resulting in the recipient cell becoming F+.

Therefore, the correct answer is B) donor Hfr recipient F+.