Plasma Membrane Structure and Functions
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Questions and Answers

What is the primary component of the plasma membrane?

  • Carbohydrates
  • Proteins
  • Phospholipids (correct)
  • Cholesterol
  • Which part of the phospholipid molecule is hydrophilic?

  • Tail
  • Head (correct)
  • Both head and tail
  • Neither head nor tail
  • What type of substances do membrane proteins allow to pass through the plasma membrane?

  • Lipid-soluble substances only
  • Sugars and proteins
  • Cholesterol only
  • Electrolytes and non-lipid soluble substances (correct)
  • What is the function of branched carbohydrate molecules attached to the outside of the cell?

    <p>Act as self markers</p> Signup and view all the answers

    Which component influences the transfer of substances across the plasma membrane?

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

    What is the function of cholesterol in the plasma membrane?

    <p>Stabilizes the phospholipid bilayer</p> Signup and view all the answers

    How do the differences in the arrangement of phospholipids influence the transfer of substances across the membrane?

    <p>They regulate the movement of hydrophilic and hydrophobic substances</p> Signup and view all the answers

    What is the role of membrane proteins that extend through the plasma membrane?

    <p>They mediate the transport of water-soluble substances</p> Signup and view all the answers

    How do carbohydrate molecules attached to the outside of the cell contribute to the cell's immunological identity?

    <p>They act as 'self' markers for immunological identity</p> Signup and view all the answers

    What is the primary function of phospholipids in the plasma membrane?

    <p>Stabilize the membrane structure</p> Signup and view all the answers

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