BIO 1140 Lecture Notes - Lecture 4: Hentai, Phagocytosis, Transfer Rna
4 Apr 2016
School
Department
Course
Professor
Document Summary
5 reasons for having them: boundary; selecive permeability, organize and scafold, regulate solute transport, receive signals, communicaion. Model deined in 1972 by singer and nicolson. Fluid lipid molecules with embedded, free-loaing or anchored proteins. Two facing sheets/luid lipid layers provide structure. Mosaic of diferent proteins allow various funcions (speciicity) Membrane is very dynamic, all of those phospholipids can be moving by lateral difusion, they can also rotate, and lexion. Flip-lop (changing from- layer 1 to layer 2) [rarely occurs] The two layers are not symmetrical, since they face diferent environment (e. g. one facing outwards, one facing the cytoplasm) hence rarely occur lip-lop. Because of diferent in environment / cell membrane, difernet permeability is needed as in diferent phospholipids - gives diversity of membranes, help contribute the asymmetry of the bilayer. Play an important role in luidity; both in terms of arrangement and in relaion to temperature (bufers)
