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 following short list of key features of eukaryotic cells can be used to describe eukaryotic cells without much reference to prokaryotic cells. 1  Contain membranous and non-membranous organelles that have specific functions within the cell. For example, all eukaryotic cells have (or had*1) a nucleus. Different eukaryotic cells contain different types and quantities of other organelles depending on the type and function of the particular cell e.g. many plant cells contain chloroplasts which are the sites of photosynthesis within those cells.