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 pitching wedge is the lowest-lofted of the named wedges, used to hit a variety of short-range shots. The modern pitching wedge has a loft of around 48Â° (exact lofts vary by clubmaker and player preference) and little or no bounce (angle of the sole to the ground).The pitching wedge is descended from the niblick, an obsolete blade-style club with a high loft.he modern sand wedge still uses the ideas of high mass, high loft, and bounce angle, but the modern sand wedge clubhead has much higher mass than earlier designs, up to 40oz (2.5 lb, 1.13 kg), to drive the clubhead through the firmer sand found in many courses.