Phospholipids post learning
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Questions and Answers

What are the three main components of a phospholipid?

  • Phosphoglycerides, phosphatidates, and plasmalogens
  • Phosphatidylethanolamine, phosphatidylserine, and phosphatidylcholine
  • Hydrocarbon chain, glycerol, and phosphate-alcohol head group (correct)
  • Fatty acids, ceramide, and sphingomyelin
  • Which is the most common phosphoglyceride found in the cell membrane?

  • Phosphatidylcholine (correct)
  • Phosphatidylethanolamine
  • Phosphatidylserine
  • Sphingomyelin
  • What is the basic structure of a phospholipid?

  • Phosphatidate
  • Phosphatidylethanolamine
  • Phosphatidic acid (correct)
  • Phosphoglyceride
  • What is the role of the transfer molecule CDP in phospholipid synthesis?

    <p>To transfer a phosphate group to the glycerol backbone</p> Signup and view all the answers

    How do phospholipids synthesized in the smooth ER reach the plasma membrane?

    <p>Via vesicle transport</p> Signup and view all the answers

    What is the classification of sphingomyelin?

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

    Which class of lipids contains phosphatidylethanolamine, phosphatidylserine, and phosphatidylcholine?

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

    What is the name of the phospholipid that has one fatty acid linked to the glycerol backbone with an ester link, while the other fatty acid has an ether link?

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

    What is the cellular location of phospholipid synthesis?

    <p>Smooth ER</p> Signup and view all the answers

    What is the first step in phospholipid synthesis?

    <p>Synthesis of glycerol backbone</p> Signup and view all the answers

    What is the second step in phospholipid synthesis?

    <p>Attachment of fatty acids to backbone</p> Signup and view all the answers

    What is the third step in phospholipid synthesis?

    <p>Addition of head group</p> Signup and view all the answers

    What is the fourth step in phospholipid synthesis?

    <p>Exchange/modification of head group</p> Signup and view all the answers

    Which molecule is used to activate one of the hydroxyl groups during the addition of the head group in phospholipid synthesis?

    <p>Cytosine diphosphate (CDP)</p> Signup and view all the answers

    What is the role of flippase in phospholipid synthesis?

    <p>Translocation of phospholipids across the ER membrane</p> Signup and view all the answers

    Which of the following is NOT a step in phospholipid synthesis?

    <p>Exchange/modification of fatty acids</p> Signup and view all the answers

    Which nucleotide is used as a methyl donor in the conversion of phosphatidylethanolamine to phosphatidylcholine?

    <p>S-adenosylmethionine (SAM)</p> Signup and view all the answers

    Where does phospholipid synthesis primarily occur?

    <p>Smooth ER</p> Signup and view all the answers

    Which phospholipid plays an important role in cell signaling?

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

    How are phosphatidylserine and phosphatidylethanolamine interconverted?

    <p>By exchange of head groups</p> Signup and view all the answers

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