Unit 3 pp #8
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  • 1. CELL MEMBRANE (also called plasma membrane)
    • Cell membranes are made mainly of ________________ & __________________
    PHOSPHOLIPIDS PROTEINS Image from: © Pearson Education Inc, Publishing as Pearson Prentice Hall; All rights reserved Outside of cell Inside of cell (cytoplasm) Cell membrane Proteins Protein channel Lipid bilayer Carbohydrate chains
  • 2. LIPID TAILS ARE HYDROPHOBIC HYDROPHILIC  HYDROPHOBIC  Image by Riedell
  • 3. Oil and water don’t mix! Image from: http://employees.csbsju.edu/hjakubowski/classes/ch112/lipids/micbilayer.gif
  • 4. PHOSPHOLIPID BILAYER Image from: http://employees.csbsju.edu/hjakubowski/classes/ch112/lipids/micbilayer.gif
  • 5. CELL MEMBRANE Proteins that stick on the surface = _____________ (either inside or outside of cell) Proteins that stick INTO membrane = ________________ (can go part way in or all the way through) PERIPHERAL INTEGRAL
  • 6.
    • Recognize “self”
    GLYCOPROTEINS GLYCOPROTEINS are PROTEINS with carbohydrates attached Image from: http://faculty.clintoncc.suny.edu/faculty/Michael.Gregory/files/Bio%20101/Bio%20101%20Lectures/Membranes/membrane.htm
  • 7. WHAT DOES IT DO?
    • Acts as a boundary
    • Controls what enters and leaves cell
    Images from: http://vilenski.org/science/safari/cellstructure/cellmembrane.html http://www.mccc.edu/~chorba/celldiagram.htm
  • 8. Cell membranes MOVE!
    • Molecules in cell membranes are
    • constantly moving and changing
    Click to See Fluidity Animation from: http://www.sp.uconn.edu/~terry/images/anim/fluidmem.gif
  • 9. CELL MEMBRANE (PLASMA MEMBRANE) Made mainly of ____________________ and _________________ HYDROPHOBIC “tails” of phospholipids make molecules line up as LIPID ________________ with POLAR heads facing _______ & NON-POLAR tails facing ________ Proteins attached to surface (inside or outside)= _____________ Proteins stuck into membrane = ______________ (can go part way in or all the way through)
    • OTHER MOLECULES:
        • GLYCOPROTEINS
        • (proteins with ___________attached)
        • STEROIDS (lipids)
    Membranes are ____________________________________ (=Semi-permeable) Allow certain molecules to pass through; but keep others out __________________ = gel-like material + organelles between nucleus and cell membrane “ recognize self” phospholipids proteins BILAYER out in Peripheral Integral sugars SELECTIVELY PERMEABLE cytoplasm