CHEM 350 Lecture Notes - Lecture 4: Nuclear Lamina, Nuclear Membrane, Nuclear Pore
Document Summary
The nucleus of a eukaryotic cell: an overview: cells possess mechanisms that allow them to express their genetic information selectively, following only those instructions that are relevant for that cell at that particular time. Nuclear contents - viscous, amorphous mass of material enclosed by a complex nuclear envelope that forms a boundary between the nucleus & cytoplasm; its morphology is relatively undistinguished. Included within a typical interphase (nonmitotic) cell nucleus are: a. Chromosomes present as highly extended nucleoprotein fibers called chromatin b. Nucleolus (nucleoli - plural) - one or more; irregularly-shaped, electron-dense, amorphous structures that function in the synthesis of rrna & the assembly of the ribosomes d. Nucleoplasm - the fluid substance in which the solutes of the nucleus are dissolved. The nuclear envelope: the nuclear envelope is complex; consists of several distinct components; core of nuclear envelope consists of 2 cellular membranes arranged parallel to one another & separated by 10 - 50 nm a.
