Membrane structure, I - Lawndale High School

Date ______ Chapter 7 - Membrane Structure & Function Membrane structure, I Selective permeability Amphipathic

hydrophobic & hydrophilic regions Singer-Nicolson: fluid mosaic model What structure looks familiar? Membrane structure, II

Phospholipids membrane fluidity Cholesterol membrane stabilization Mosaic Structure Integral proteins

transmembrane proteins Peripheral proteins surface of membrane Membrane carbohydrates cell to cell recognition oligosaccharides (cell markers)

glycolipids; glycoproteins What looks familiar? Membrane structure, III Membrane

protein function: Transport Enzymatic activity Signal transduction Intercellular joining Cell-cell recognition ECM attachment What looks familiar? Membrane traffic Diffusion

tendency of any molecule to spread out into available space Concentration gradient Passive transport diffusion of a substance across a biological membrane

Osmosis the diffusion of water across a selectively permeable membrane Seen on U-tube Extremely important. Lets model this. Water balance in cells Osmoregulation

Hypertonic lower concentration of solutes Isotonic

higher concentration of solutes Hypotonic control of water balance equal concentrations of solutes

Cells with Walls: Turgid (very firm) Flaccid (limp) Plasmolysis~ plasma membrane pulls away from cell wall Hippo and the hyper person Specialized Transport

Transport proteins Facilitated diffusion passage of molecules and ions with transport proteins across a membrane down the concentration gradient Active

transport movement of a substance against its concentration gradient with the help of cellular energy How to get into the club Types of Active Transport Sodium-potassium pump

Exocytosis secretion of macromolecules by the fusion of vesicles with the plasma membrane Endocytosis import of macromolecules by forming new vesicles with the plasma membrane

phagocytosis pinocytosis receptor-mediated endocytosis (ligands) Wheel on the bus go

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