Prokaryotes have only one lipid bilayer- the cell membrane (also known as the plasma membrane). Many prokaryotes also have a cell wall, but the cell wall is composed of proteins or long chain carbohydrates, not lipids.
3. countable noun. A wedge is an object with one pointed edge and one thick edge, which you put under a door to keep it firmly in position. 4. countable noun. A wedge is a piece of metal with a pointed edge which is used for splitting a material such as stone or wood, by being hammered into a crack in the material.
A wedge is a battlebot that is designed with an incline plane on the front of it. The whole point of a wedge is to give the battlebot the ability to pick up its opponent and drive them into the wall of the arena or some other hazard. This battlebot is typically very structurally sound making it very hard to destroy.