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Sphingophospholipids quiz

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  • What is the backbone molecule of sphingophospholipids?
    Sphingophospholipids have a sphingosine backbone instead of a glycerol backbone.
  • What is the most common sphingophospholipid?
    The most common sphingophospholipid is sphingomyelin.
  • What are the possible polar head groups found in sphingomyelin?
    Sphingomyelin can have either a phosphocholine or a phosphoethanolamine as its polar head group.
  • What structural feature makes sphingomyelin amphipathic?
    Sphingomyelin is amphipathic because it has a polar head group and nonpolar fatty acid tails.
  • Where is sphingomyelin primarily found in the body?
    Sphingomyelin is primarily found in the myelin sheath that surrounds nerve cell axons.
  • What is the main function of the myelin sheath?
    The myelin sheath insulates nerve cell axons and allows for rapid transmission of nerve signals.
  • How does the platform of sphingophospholipids differ from that of glycerophospholipids?
    Sphingophospholipids use a sphingosine platform, while glycerophospholipids use a glycerol platform.
  • What makes a phospholipid a sphingophospholipid?
    A phospholipid is a sphingophospholipid if it has a sphingosine backbone covalently attached to a phosphate group.
  • Why is sphingomyelin considered the most common sphingolipid?
    Sphingomyelin is the most common sphingolipid because it is the main component of the myelin sheath, which is widespread in the nervous system.
  • What is the role of the phosphate group in sphingomyelin?
    The phosphate group in sphingomyelin forms part of the polar head, contributing to its amphipathic nature.
  • What is the significance of the 'myelin' in the name sphingomyelin?
    The 'myelin' in sphingomyelin refers to its abundance in the myelin sheath of nerve cells.
  • What type of molecule is sphingomyelin classified as?
    Sphingomyelin is classified as both a sphingolipid and a phospholipid.
  • What is the basic template of a phospholipid?
    A phospholipid consists of a platform (glycerol or sphingosine), at least one fatty acid chain, and a phosphate group.
  • How does sphingomyelin contribute to membrane structure?
    Sphingomyelin's amphipathic nature makes it essential for forming and stabilizing membrane structures, especially in nerve cells.
  • What is the main takeaway about sphingomyelin from this lesson?
    Sphingomyelin is the most common sphingophospholipid and sphingolipid, and it is a major structural component of the myelin sheath in the nervous system.