Choline and Lung Surfactant Quiz
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Questions and Answers

What is the major structural lipid in the membranes of nerve tissue?

  • Glycolipids
  • Sphingomyelin (correct)
  • CDP-diacylglycerol
  • Phosphatidylinositol
  • What is the product of sphingomyelin degradation by sphingomyelinase?

  • Phosphorylcholine
  • IP3
  • Sphingosine (correct)
  • Diacylglycerol
  • Which enzyme is responsible for degrading sphingomyelin into ceramide?

  • Phospholipase A₂
  • Phospholipase C
  • Ceramidase
  • Sphingomyelinase (correct)
  • What is the role of diacylglycerol in cellular responses?

    <p>Activate protein kinase C</p> Signup and view all the answers

    Which coenzyme is required for the reaction involving sphingosine-based phospholipids?

    <p>Pyridoxal phosphate</p> Signup and view all the answers

    What is the major component of skin that regulates water permeability?

    <p>Ceramide</p> Signup and view all the answers

    What mediates the mobilization of intracellular calcium in response to PIP2 degradation?

    <p>Inositol 1,4,5-trisphosphate (IP3)</p> Signup and view all the answers

    What is the primary fatty acid found in Sphingomyelin of the myelin sheath?

    <p>Lignoceric Acid</p> Signup and view all the answers

    What is the primary function of glucocerebroside?

    <p>Serving as an intermediate in the synthesis and degradation of glycosphingolipids</p> Signup and view all the answers

    What differentiates acidic glycosphingolipids from other types?

    <p>They contain sulfate groups or sialic acid for negative charge</p> Signup and view all the answers

    Where are gangliosides primarily found?

    <p>In ganglion cells of the central nervous system</p> Signup and view all the answers

    What makes sulfatides unique among glycosphingolipids?

    <p>They contain sulfated galactosyl residues and are negatively charged</p> Signup and view all the answers

    Which part of gangliosides contributes to their negative charge?

    <p>N-acetylneuraminic acid (NANA)</p> Signup and view all the answers

    How do glucosylceramides differ from gangliosides?

    <p>They contain N-acetylneuraminic acid (NANA) residues</p> Signup and view all the answers

    What is the primary site of synthesis for glycosphingolipids?

    <p>Golgi apparatus</p> Signup and view all the answers

    What aspect of sulfatides distinguishes them from other cerebrosides?

    <p>Sulfated galactosyl residues and negative charge</p> Signup and view all the answers

    What is the primary role of gangliosides within nerve cells?

    <p>Electrical signal propagation</p> Signup and view all the answers

    What sets apart ceramides from sulfatides among cerebrosides?

    <p>Sulfate groups give sulfatides a negative charge</p> Signup and view all the answers

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