BCH 361 Exam 3

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Zerocrew1984
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267756
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BCH 361 Exam 3
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2014-03-25 13:27:31
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bch 361 exam 3
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  1. What are the basis for grouping substances as lipids?
    • Poor solubility in polar solvents
    • Having a preponderance of nonpolar groups
    • High solubility in nonpolar solvents
  2. What are important structural features of waxes?
    • They are esters of long chain carboxylic acids and long chain alcohols
    • They are found in biological protective coatings
  3. What is a lipid that is not found in animal membranes?
    Triacylglycerols
  4. What is the main energetic driving force for the formation of phospholipid bilayers?
    The hydrophobic interaction among the hydrocarbon tails of the phospholipids
  5. What are the 2 statements that are consistent with the fluid mosaic model of membranes?
    • Carbs are covalently bonded to the outside of the membrane.
    • Some proteins and lipids undergo lateral diffusion along the inner or outer surface of the membrane.
  6. What are 3 statements that are consistent with membrane transport?
    • Transport proteins may be involved in bringing substances into cells.
    • Some transport processes use the energy of a second transport process to move species across membranes
    • Active transport moves an uncharged substance from a region i which its concentration is lower to one in which its concentration is higher.
  7. 2 dominant properties of Vitamin K?
    • Lipid soluble
    • Required to modify prothrombin by the addition of a carboxyl group
  8. What are the 2 main structural features of leukotrienes?
    • 3 conjugated double bonds
    • They are carboxylic acid-containing lipids
  9. complex mixture of esters of long-chain carboxylic acids and alcohols.
    Found as protective coatings for plants and animals.
    Waxes
  10. the second most abundant group of naturally occurring lipids and they are found in plant and animal membranes.
    Phosphoaclygly cerols (phosphatidyl esters)
  11. When one alcohol group of glycerol is esterified by a phosphoric acid rather than by a carboxylic acid, phosphatidic acid is produced.
    Phosphoclylglycerols aka phospholipids

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