20 points "structure of a prokaryotic cell" * state the function of each component: cell wall - cell membrane - outer membrane - pili - ribosome - dna - flagellum -

Cell wall - Adds structural support to the cell. Holds the cells together
Cell membrane - Serves as a barrier to the cell and allows more nutrient and molecules to move in and out of the cell without letting things that can harm the cell in. 
Outer membrane - Serves the same basic functions a the cell membrane. (Depending on how complicated the class your in is, I would visit this website for more information... https://en.wikipedia.org/wiki/Bacterial_outer_membrane )
Pili - Help the cell move and attach the bacteria to surfaces are other cells. 
DNA - Contains the genetic instructions on what the cell can physically do, operate, and reproduce. 
Flagellum - Helps the cell move. It kind of acts like a propeller for the cell so that it can move around.