In some vehicles the retractor â not the latchplate â provides the locking part needed to keep a car seat in place at all times. The purpose of the retractor is to store the excess webbing. These retractors are usually present when a non-locking latchplate (sliding, sewn-on, or dynamic locking) is present.
In cell biology, the nucleus (pl. nuclei; from Latin nucleus or nuculeus, kernel) is a membrane-enclosed organelle found in eukaryotic cells. It contains most of the cell's genetic material, organized as multiple long linear DNA molecules in complex with a large variety of proteins such as histones to form chromosomes.The genes within these chromosomes make up the cell's nuclear genome.t contains most of the cell's genetic material, organized as multiple long linear DNA molecules in complex with a large variety of proteins such as histones to form chromosomes.
Cells fall into two broad categories, depending on whether they contain a nucle-. us. The nucleus is a large membrane-. enclosed structure that contains the cellâs. genetic material in the form of DNA. The. nucleus controls many of the cellâs activities. Prokaryotic cells have genetic material that is. not contained in a nucleus. Bacteria are. prokaryotes. Eukaryotic cells contain a nucle-. us in which their genetic material is separat-. ed from the rest of the cell.