University:
Loyola University Maryland
Course:
BL 111 | Environmental Biology
Academic year:

2024
Views:

179

Pages:

2
Author:

Natasya J.

Nucleus Nucleus is the most prominent organelle of the cell. The number of nucler may vary, they may be uninucleate (single nucleus). binucleate (two nucler) or even multi-nucleare. Certain eukaryone cells such as the mature sieve tubes ot higher plants and mammalian erghtrocytes contam no nucleus. Prokoryotic Cells lack nucleus and is complemented by nucled. The contents of the nucleus ore DNA genome, RNA synthetic apparatus, and a fibrous Matrix. It is surrounded by two membranes, each one a phospholiped bilayer containing many alfferent types of protems. The inner nuclear membrone detunes the nucleus it self. In most cells, the outer nuclear Membrane is continuous with the rough endoplasmic retculum, and the space between the inner and outer nuclear membranes is continuous with the lumen of the rough endoplasmic reticulum. The two nuclear membrones appear to fuse at nuclear pores, the ring- le complexes composed of spectic membrane proteins through which material moves between the nucleus and the cytosol. It contains cell's genetk matera organized as multiple long linear DNA molecules in compiex with histones. to form chromosome. The grones within these chromosomes are the cell's nucleas genome. The function is to maintain the integrity of the genes that controls the activities of the cell by regulating gene expression. Notes : In cell bology, the nucleus (plural -nucler: from latm nocleus or nuculeus, meaning kernel or seed) is membrane - enclosed organelle found in eukaryote cells. Eukaryotes usually have a single nucleus, but a few cell types, such as mammalia ted blood cells. have no nucler. and a few others have many.