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.
Gap wedges were designed to bridge the gap between the pitching wedge and the sand wedge and typically have a loft angle between 50 and 56 degrees. Theyâre the newest of the wedges, designed in response to casual golfersâ need for more range.