Topic 1.3 Membrane Structure

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Across
  1. 1. _________ Model:The currently accepted model of cell membrane structure, which envisions the membrane as a mosaic of individually inserted protein molecules drifting laterally in a fluid bilayer of phospholipids.(5, 6)
  2. 3. A double layer of phospholipid molecules arranged with polar heads in contact with water and non-polar tails in contact with each other (9, 7)
  3. 4. ________ molecule: Molecule with an unequal distribution of charge, resulting in the molecule having a positive end and a negative end (5)
  4. 7. A lipid with one or more covalently attached carbohydrates (10)
  5. 10. Having an aversion to water; tending to coalesce and form droplets in water (11)
  6. 12. _________ Model: Model of the cell membrane in which the phospholipid bilayer is enclosed between two layers of protein (the "sandwich" model)(6-8)
  7. 16. A lipid consisting of two fatty acids and a phosphate group bound to a glycerol (12)
  8. 18. An integral protein that spans the membrane - has contact with the interior and the exterior of the cell (13)
Down
  1. 2. A molecule that has both a hydrophilic region and a hydrophobic region (11)
  2. 4. Membrane associated proteins loosely bound to the surface of the membrane and not embedded in the lipid bilayer.
  3. 5. Having an affinity for water (11)
  4. 6. _________ molecule: Molecule with equal distribution of charge (3-5)
  5. 8. A protein with one or more covalently attached carbohydrates (12)
  6. 9. A chemical group consisting of a phosphorus atom bonded to four oxygen atoms - is always negatively charged (9, 5)
  7. 11. ________ fatty acid A fatty acid possessing one or more double bonds between the carbons in the hydrocarbon tail, leading to kinks in the chains reducing the intermolecular forces between phospholipids (11)
  8. 13. A minute spherical sac of phospholipid molecules enclosing a water droplet (8)
  9. 14. A steroid lipid that forms an essential component of animal cell membranes and is vital to maintain membrane fluidity within an optimal range (11)
  10. 15. A structure whereby lipid molecules arrange themselves in a spherical form in aqueous solutions (7)
  11. 17. Membrane proteins which penetrate the hydrophobic interior of the lipid bilayer