A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the bearing races. The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads. It achieves this by using at least two races to contain the balls and transmit the loads through the balls.
1 The. 2  for a eukaryotic cell is the same kind of structure, and has the same function as the plasma membrane of a prokaryotic cell. ( 3 ER) is a system of membrane-enclosed channels which ramifies throughout the cytoplasm of the cell. 4  It comes in two types--smooth and rough. , which is quite different from the peptidoglycan of prokaryotic cell walls. 2  The primary function of the cell wall is support, and inconjunction with the central vacuole, to create turgor (stiffness) in plant structures like leaves. 3  Plant cells contain a specialized vacuole called the. .
The nucleus is an organelle that is surrounded by a double membrane called the nuclear envelope. The nuclear envelope separates the contents of the nucleus from the rest of the cell. Eukaryotic cells also have a cell membrane (plasma membrane), cytoplasm, cytoskeleton, and various cellular organelles.xamples of organelles found in plant cells and animal cells include: Prokaryotic cells have a structure that is less complex than eukaryotic cells. They do not have a nucleus or region where the DNA is bound by a membrane. Prokaryotic DNA is coiled up in a region of the cytoplasm called the nucleoid.