labl102 Bio

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  1. Cytosol
    Is within the cell and is made of mostly water and contains a wide variety of dissolved molecules and ions. Having the proper amount of water, proper ion concentration and proper pH within the cell is is of critical importance.
  2. Plasma membrane
    Forms the external boundary of a cell. (Made from phospholipids.)
  3. Phospholipid
    Makes up the plasma membrane. Each phospholipid has a hydrophilic polar head (pointed outwards) and a non polar hydrophobic tail. (pointed inwards) in bilayerImage Upload 1 (shows bilayer)
  4.  Semi / Selectively permeable
    Term used to describe cell membrane meaning that it only lets certain select things into cell
  5. What types of particles are more likely to permeate the cell membrane?
    Smaller non polar molecules.. Very difficult for ions. 
  6. Membrane channel
    • Made of proteins that are imbedded in and span the phospholipid bilayer. A single channel will only let one specific type of molecule or ion pass through the plasma membrane
    • Example: Sodium channels only let sodium ions pass through.
  7. Water channel
    Used by cells to facilitate the large scale movement of water molecules across their plasma membranes.. making cells highly permeable to water. 
  8. Osmosis
    The net movement of water across a semi permeable membrane
  9. Isotonic Solution
    Ideal situation for a cell. Cells won't gain or lose water, because the solute concentration is the same on both sides... Water goes where solute is more concentrated. 
  10. Hypertonic Solution
    The solute concentration is greater outside the cell causing water to move outside of the cell.
  11. Hypotonic Solution
    Opposite of hypertonic... The concentration is greater inside the cell, causing water from the outside to come in.
  12. Turgid
    Used to describe plants, this is what makes them stiff due to the amount of water inside the cell. It's the pressure exerted by the cell wall in a well watered plant. Loss of turgur results when plant doesn't have enough water / begins to wilt.
  13. What happened when plant cell was placed in saltshriv solution?
    Cells began to deflate. Appeared shrivled. Chloroplasts floated to middle.. no longer pushed to the edge of the cell.
  14. Hemolysis
    The bursting of red blood cells.
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labl102 Bio
2013-01-16 17:16:47
Bio lab

Terms from lab L102
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