The word nucleus derived d from a Latin word which means kernel. The cell nucleus is a membrane bound structure that contains the cells hereditary information and controls the cells growth and reproduction. It is the command center of a eukaryotic cell and is commonly the most prominent organelle in a cell it is bound by a double membrane called the nuclear envelope. This membrane separates the contents of the nucleus from the cytoplasm. The nucleus maintains the security of the genes and controls the functions of entire cell by regulating gene expression. This is why the nucleus is sometimes referred to as the control center or the brain of the cell. STRUCTURE The main structure making up the nucleus are the nuclear envelope, a double membrane that encloses the entire organelle and insolate it contents from the cellular cytoplasm, and the nuclear matrix (which includes the nuclear lamina),a network within the nucleus that adds mechanical supports. It is the largest organelle of the cell. FUNCTION 1) It stores the cells hereditary material or DNA and it the cells activities which include growth, intermediary metabolism. Protein synthesis and reproduction (cell division). 2) Large molecules cannot get inside the nucleus through the nuclear membrane, s holes called nuclear pores. These pores regulate the transport of those molecules by carrier protein embedded in the double layer of the membrane. 3) It is the site for genetic transcription. Nucleus is to govers in gene expression and facilitates DNA replication during cell cycle. PARTS OF NUCLEUS Five main parts of nucleus. 1. Nuclear membrane 2. Nuclear sap 3. Chromatin network or fibers 4. Nucleolus 5. Endosomes nibtumgt /HX qlkB1_qNsGdIwMu_4WCfOD.g8biW0)2w.OFk1go-Pwqac_.WXf3qnO.WxI78q @(E58cQWXpDy3B3DOpws1Gg/cg5zlb8sYErkal68bWwFsXmL-1-/i./67jr83xvjhW6fHad CS [email protected] SDnY)E
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