ANP 1105 Chapter Notes - Chapter 3: Membrane Transport, Lipid Bilayer, Lipid Raft

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1105
• Professor: Jacqueline Carnegie

Document Summary

Plasma membrane: separates intracellular fluid within cells and extracellular fluid outside cells. Fluid mosaic model: depicts pm as a bilayer with lipid and protein molecules dispersed in it. The proteins which float in the lipid bilayer create a constantly changing mosaic characteristic. Lipid bilayer is composed of: phospholipids, glycolipids, cholesterol, and lipid rafts (and proteins) Glycolipid: lipids with attached sugar groups, found only on the outward-facing layer of phospholipids, the sugar group makes that end of the glycolipid polar and the fatty acid tails are nonpolar. Cholesterol: has a polar region (hydroxyl group) and a nonpolar region (its fused ring system) Membrane proteins: make up half the pm"s mass, responsible for pm"s special functions. Integral proteins: firmly inserted into lipid bilayer, most are transmembrane proteins that span the entire membrane, have both hydrophobic and hydrophilic ends so can interact with nonpolar lipid tails and water inside and outside the cell.