What is a Ball Bearing? The Function of Ball Bearings. From small and large motors to car axles to electric fans and hard disc drives (HDDs), ball bearings are used in a wide array of machines for rotary motion. Ball bearings support rotary parts and reduce friction to facilitate the smooth operation of machines.
Best Answer: a) Plant cells contain large central vacuole, chloroplasts (if it is a photosynthetic plant cell) and a cellulose cell wall not found in animal cells. b) Eukaryotic cells have their chromosomes (DNA) contained in a nucleus, prokaryotic cells don't.Eukaryotic cells have a true nucleus, bound by a double membrane. Prokaryotic cells have no nucleus. The purpose of the nucleus is to sequester the DNA-related functions of the big eukaryotic cell into a smaller chamber, for the purpose of increased efficiency.
Biologists recognize 2 basic cell types: prokaryotic and eukaryotic. The earliest cells on earth were relatively simple prokaryotic cells. Over billions of years, some of these early prokaryotic cells evolved into present-day prokaryotic cells, while others evolved into much larger and more complex eukaryotic cells.he interior of eukaryotic cells is generally divided into many specialized compartments by internal membranes (membranes separate from the plasma membrane) and membrane-bound organelles (organelles completely surrounded by membranes). Usually, prokaryotic cells lack internal membranes and membrane-bound organelles.