1 / 15

Date ______

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

ananda
Télécharger la présentation

Date ______

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Date ______ Chapter 7 - Membrane Structure & Function

  2. Membrane structure, I • Selective permeability • Amphipathic • hydrophobic & hydrophilic regions • Singer-Nicolson: • fluid mosaic model

  3. What structure looks familiar?

  4. 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

  5. What looks familiar?

  6. Membrane structure, III • Membrane protein function: • Transport • Enzymatic activity • Signal transduction • Intercellular joining • Cell-cell recognition • ECM attachment

  7. What looks familiar?

  8. 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

  9. Seen on “U-tube” Extremely important. Let’s model this.

  10. Water balance in cells • Osmoregulation • control of water balance • Hypertonic • higher concentration of solutes • Hypotonic • lower concentration of solutes • Isotonic • equal concentrations of solutes • Cells with Walls: • Turgid (very firm) • Flaccid (limp) • Plasmolysis~ plasma membrane pulls away from cell wall

  11. Hippo and the hyper person

  12. 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

  13. How to get into the club…

  14. 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)

  15. Wheel on the bus go…

More Related