BIOL 120 Lecture Notes - Lecture 3: Ribosomal Rna, Chromosome, Euchromatin
Document Summary
The nucleus is separated from the cytoplasm by the nuclear envelope which consists of two membranes. Nuclear envelope: network of protein filaments (lamins) which reinforces the nuclear envelope in animal cells. Other proteins reinforce the nuclear envelope in protists, fungi, and plants. Nuclear pore complex: formed of many types of proteins called the nucleoporins. Embedded in the nuclear envelope are the paths for the assisted exchange of large molecules such as proteins and rnas. Nuclear localization signal: many proteins move from the cytosol into the interior of the nucleus. They are targeted with a sequence of 7-41 amino acids. Transport of nuclear proteins: cargo molecules associated with a transport protein that act chaperone. Prevents the transport of material not meant to cross the nuclear membrane. Nucleoplasma: the liquid or semi-liquid substance within the nucleus. Most of the space inside the nucleus is filled with chromatin. Most active portion of he genome within the cell nucleus.
