Phosphatidylcholine (Lecithin) Quiz
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Questions and Answers

Which enzyme removes the fatty acid in the 2nd position of phospholipids?

  • Phospholipase D
  • Phospholipase A1 (correct)
  • Phospholipase C
  • Phospholipase B
  • What is the main difference between Plasmalogens and Cephalins?

  • The type of esterification
  • The replacement of fatty acid in the 1st position (correct)
  • The presence of choline
  • The type of phosphate group
  • Which component is replaced by a fatty alcohol in Plasmalogens?

  • Esterification bond
  • Fatty acid in the 2nd position (correct)
  • Amino Alcohol unit
  • Phosphate group
  • What is the main function of Platelet Activating Factor (PAF)?

    <p>Mediating leukocyte functions</p> Signup and view all the answers

    How are Lysophospholipids usually produced in the blood?

    <p>By the action of snake venom</p> Signup and view all the answers

    What structural feature characterizes Diphosphatidylglycerol (Cardiolipin)?

    <p>Double esterification with glycerol</p> Signup and view all the answers

    Which nitrogenous base is esterified with the phosphate group of phosphatidic acid in Phosphatidylcholine?

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

    What is the major constituent of the surfactant that prevents adherence of the inner surfaces of the lungs due to surface tension?

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

    In which Glycerophospholipid type does the phosphate group of phosphatidic acid esterify with the amino alcohol unit serine?

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

    Which Glycerophospholipid type plays a role in apoptosis or programmed cell death?

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

    Which nitrogenous base is involved in the esterification with the phosphate group of phosphatidic acid in Phosphatidylethanolamine?

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

    Where is Phosphatidylinositol primarily found?

    <p>Cell membranes</p> Signup and view all the answers

    What is the backbone of sphingomyelin?

    <p>Amino alcohol sphingosine</p> Signup and view all the answers

    In sphingomyelin, a long chain fatty acid is attached to the amino group of sphingosine through which type of linkage?

    <p>Amide linkage</p> Signup and view all the answers

    Which phospholipid accounts for 20% of mitochondrial lipids?

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

    In sphingomyelin, what is esterified to the 1 position of sphingosine?

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

    Which phospholipid is commonly found in cell membranes, especially in lungs and brain (myelin sheath)?

    <p>Phosphatidylcholine (Lecithin)</p> Signup and view all the answers

    Which property enables phospholipids to facilitate emulsification of other insoluble fats?

    <p>Presence of both nonpolar and polar groups</p> Signup and view all the answers

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