BSC 2023 Lecture Notes - Lecture 19: Microtubule Organizing Center, Nuclear Pore, Nuclear Membrane
Document Summary
Divides and organizes spindle fibers during mitosis and meiosis. Centrosome a pair of centrioles that functions as microtubule organizing center. Nuclear envelope double membrane with nuclear pores that encloses nucleus. Chromatin diffused (spread over) threads containing dna and protein. Nuclear pores pores of the nuclear envelope that allow ribosomal subunits to exit nucleus, and protein to enter nucleus. Ribosomes molecular machine that carries out protein synthesis; consists of aggregated protein and rrna. Endomembrane system a series of membrane organelles that function in the processing of materials for the cell and includes: nuclear envelope, endoplasmic reticulum, golgi apparatus, lysosome, vesicles. Endoplasmic reticulum(er) is continuous with the nuclear envelope, and consists a membranous system of saccule and channels. 1. studded with ribosomes on side of membrane that faces cytoplasm. 2. proteins are synthesized (produce) by ribosomes and enter er interior. 4. some proteins are incorporated into membrane and some are for export. Smooth er continuous with rough er, but no ribosomes.
