The nucleus is the organelle found in eukaryotic cells. These organelles contain the majority of the genetic material of cells to form long linear DNA molecules that make up the chromosomes along with different kinds of proteins. Genes in chromosomes has shaped the genomes of the cell nucleus.

The main function of the nucleus is to maintain the integrity of genes and controlling cell activity by managing gene expression. In addition, the nucleus also serves to organize the genes during cell division, producing the mRNA to encode proteins, as a synthesis of ribosome, the site of replication and transcription of DNA, and regulate when and where gene expression must be initiated, executed, and terminated.

Nucleus has a membrane which shrouded the core shroud. This membrane separates the contents of the nucleus to the cytoplasm. core is a double membrane envelope. Both sheaths are each a lipid bi-layer with associated proteins.

The membrane is perforated by a pore diameter of about 100 nm. On the lip of each pore in the membrane and outer nuclear envelope membranes fused. These pores allow the relationship between nukleoplasma (liquid core) with the cytoplasm (cell fluid).

Inside the nucleus are chromatin granules located within nukleoplasma. Evident when cells do not divide. At the time the cell divides into such thickened granular chromatin threads called chromosomes. Chromosomes contain DNA (dioksiribonukleat acid) that serves convey genetic information through protein synthesis.

Source from: Wikipedia

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