The process you're describing is called conjugation, and the two bacteria that use this method to exchange genetic material are F+ and F- bacteria.

Here's a breakdown:

* F+ bacteria contain a special plasmid called the F-plasmid (fertility factor).

* F- bacteria lack the F-plasmid.

* During conjugation, an F+ bacterium forms a pilus (a thin, temporary protein bridge) to connect with an F- bacterium.

* Through this pilus, a copy of the F-plasmid is transferred from the F+ bacterium to the F- bacterium.

* The F- bacterium then becomes F+ because it now possesses the F-plasmid.

This process allows for the transfer of genes, including antibiotic resistance genes, between bacteria, leading to the spread of antibiotic resistance.