Unit 3 pp #8
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Unit 3 pp #8

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    Unit 3 pp #8 Unit 3 pp #8 Presentation Transcript

    • 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
    • LIPID TAILS ARE HYDROPHOBIC HYDROPHILIC  HYDROPHOBIC  Image by Riedell
    • Oil and water don’t mix! Image from: http://employees.csbsju.edu/hjakubowski/classes/ch112/lipids/micbilayer.gif
    • PHOSPHOLIPID BILAYER Image from: http://employees.csbsju.edu/hjakubowski/classes/ch112/lipids/micbilayer.gif
    • 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
      • 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
    • 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
    • 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
    • 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