So if we take a look at the following prokaryotic cell arabacterial cell, this is the main DNA molecule of our cell. And this smaller one is Aroplasmid. Now, what's the big deal with plasmids and conjugation? Well, basically, certain types of cells contain special plasmids known as the fertility factor or the F factor. And these are plasmids that code for special types of proteins that build something called the sex Pillus. Now, the sex Pillus is basically the cytoplasmic bridge that connects one cell to another cell and allows one cell to transfer genetic information to a different cell, as we'll see in just a moment.