The sex pilus originates from "the donor cell" during bacterial conjugation.
The sex pilus is a specialized appendage that extends from the donor bacterial cell. It plays a crucial role in the process of bacterial conjugation by establishing physical contact between the donor and recipient cells. The sex pilus facilitates the transfer of genetic material, typically a plasmid, from the donor cell to the recipient cell. It acts as a bridge through which the DNA is transferred, allowing for the exchange of genetic information between the two cells. The sex pilus is primarily synthesized and protrudes from the surface of the donor cell, initiating the contact and attachment between the donor and recipient cells during conjugation.