Biology Chapter 7

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  1. Plasma Membrane
    is the boundary that separates the living cell from its surroundings
  2. Selective Permeability
    allowing some substances to cross it more easily than others ; the plasma membrane exhibits it
  3. Phospholipids
    the most abundant lipid in the plasma membrane
  4. Amphipathic Molecules
    phospholipids ; contain hydrophobic and hydrophilic regions
  5. Fluid Mosaic Model
    states that a membrane is a fluid structure with a "mosaic" of various proteins embedded in it.
  6. Membranes must be
    fluid to work properly; they are usually about as fluid as salad oil
  7. Phospholipids in the plasma membrane
    can move within the bilayer
  8. A membrane is a
    collage of different proteins embedded in the fluid matrix of the lipid bilayer
  9. Proteins determine
    most of the membrane's specific functions
  10. Peripheral Proteins
    are bound to the surface of the membrane
  11. Integral Proteins
    penetrate the hydrophobic core
  12. The hydrophobic regions of an Integral Protein consist of
    one or more stretches of nonpolar amino acids, often coiled into alpha helices
  13. Six Major Functions of Membrane Proteins:
    • 1) Transport
    • 2) Enzymatic Activity
    • 3) Signal Transduction
    • 4) Cell-cell Recognition
    • 5) Intercellular Joining
    • 6) Attachment to the cytoskeleton and extracellular matrix (ECM)
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Biology Chapter 7
2013-02-25 22:46:45
Biology 101

University of South Carolina Biology 101 Exam 2
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