We're going to discuss the structure, the composition, and the mechanism by which prokaryotic Flagella works. And then we're going to compare that to eukaryotic Flagella. So let's begin with the prokaryotic case. So prokaryotic Flagellum consists of a single global protein known as Flagellin and Flagellin. This protein basically wraps around in a helical fashion to create a rigid hollow cylinder. So let's suppose we have one type of prokaryotic organism, let's say a gram negative bacteria.