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Lipids 2 quiz

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  • What are the two main classes of membrane lipids in biological systems?
    Glycerophospholipids and sphingolipids are the two main classes of membrane lipids.
  • Which two glycerophospholipids are the most common in membranes?
    Phosphatidylethanolamine and phosphatidylcholine are the most common glycerophospholipids.
  • What is the backbone structure of phosphatidylcholine?
    Phosphatidylcholine has a glycerol backbone.
  • How many fatty acids are attached to the glycerol backbone in phosphatidylcholine?
    There are two fatty acids attached to the glycerol backbone in phosphatidylcholine.
  • What group is attached to the phosphate in phosphatidylcholine?
    A choline group is attached to the phosphate in phosphatidylcholine.
  • How does phosphatidylethanolamine differ from phosphatidylcholine?
    Phosphatidylethanolamine has a different molecule (ethanolamine) attached to the phosphate instead of choline.
  • Name two other important but less common membrane glycerophospholipids.
    Phosphatidylserine and phosphatidylinositol are also important membrane glycerophospholipids.
  • What is the backbone of sphingolipids?
    Sphingolipids have a sphingosine backbone.
  • How many fatty acids are present in a typical sphingolipid?
    A typical sphingolipid has only one fatty acid.
  • What is the name of the sphingolipid that contains choline and a phosphate group?
    Sphingomyelin is the sphingolipid that contains choline and a phosphate group.
  • What is the key structural difference between glycerophospholipids and sphingolipids?
    Glycerophospholipids have a glycerol backbone and two fatty acids, while sphingolipids have a sphingosine backbone and one fatty acid.
  • Can prokaryotes synthesize phosphatidylcholine?
    No, prokaryotes cannot synthesize phosphatidylcholine.
  • What structural feature do both phosphatidylcholine and sphingomyelin share?
    Both phosphatidylcholine and sphingomyelin contain a choline group and a phosphate group.
  • What is the function of the subtle structural differences between glycerophospholipids and sphingolipids?
    These structural differences give the lipids different properties and functions in membranes.
  • What is the basic separation between sphingolipids and glycerophospholipids?
    The basic separation is whether the lipid has two fatty acids and a glycerol backbone (glycerophospholipids) or a sphingosine backbone with one fatty acid (sphingolipids).