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.
Cell Nucleus and Nuclear Envelope The nucleus of a eukaryotic cell contains the DNA, the genetic material of the cell. The DNA contains the information necessary for constructing the cell and directing the multitude of synthesis tasks performed by the cell in the process of life and reproduction. The nuclear envelope surrounds the nucleus with a double membrane with multiple pores.