Cell Membranes Composition and Structure
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Questions and Answers

What is the main composition of all membranes, including the plasma membrane?

  • Nucleic acids
  • Carbohydrates
  • Lipids and proteins (correct)
  • Proteins only
  • How do the lipid molecules arrange themselves in the plasma membrane?

  • Hydrophilic ends facing outwards (correct)
  • Random orientation
  • Hydrophilic ends facing the interior of the membrane
  • Hydrophobic ends facing outwards
  • Which type of proteins span the entire width of the membrane?

  • Integral membrane proteins (correct)
  • Peripherally attached proteins
  • Proteins that float in the lipid bilayer
  • Proteins with only hydrophilic regions
  • What differentiates integral membrane proteins from peripheral membrane proteins?

    <p>Association with other proteins</p> Signup and view all the answers

    In what form do carbohydrates appear in membranes?

    <p>As oligosaccharides</p> Signup and view all the answers

    What makes up a fluid mosaic in the context of membrane structure?

    <p>Proteins floating in a lipid bilayer</p> Signup and view all the answers

    Plasma membrane lipids form a lipid ______, a layer two molecules thick.

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

    The hydrophobic ends of each lipid molecule face the interior of the membrane and the hydrophilic ends face ______.

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

    Most proteins are embedded within, or float in, the lipid bilayer as a fluid ______.

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

    Some proteins, because of extensive hydrophobic regions of their polypeptide chains, span the entire width of the membrane (transmembrane proteins), whereas others are only superficially attached to the bilayer by lipid ______.

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

    Both are integral (intrinsic) membrane proteins, as distinct from peripheral (extrinsic) membrane proteins, which are membrane-bound only through their association with other ______.

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

    Carbohydrates in the form of ______

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

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