Cell Biology and Human Genetics: Biological Membranes Part I
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Questions and Answers

Which type of proteins can be extracted with Phospholipase C?

  • Lipid-anchored proteins
  • Peripheral proteins
  • GPI-proteins (correct)
  • Beta-Barrel proteins

    • How are lipid-anchored proteins bound to the membrane?

  • Connected through disulfide bonds
  • Directly inserted into the phospholipid bilayer
  • Covalently bound to the lipid (correct)
  • Associated through non-covalent interactions

    • Which type of proteins can be dissociated from the membrane by changes in pH or high concentration of salts?

  • Exoplasmic proteins (correct)
  • Permeable proteins
  • Transmembrane proteins
  • GPI-proteins

    • Where are GPI-proteins typically found in relation to the membrane?

    <p>Outer side of the membrane</p> Signup and view all the answers

    How do integral membrane proteins anchor themselves to the lipid bilayer?

    <p>By embedding hydrophobic chains into the membrane leaf</p> Signup and view all the answers

    Which type of interactions associate peripheral proteins with transmembrane proteins?

    <p>Non-covalent interactions</p> Signup and view all the answers

    Which of the following is NOT a function of the cell membrane?

    <p>Synthesizing new proteins for the cell</p> Signup and view all the answers

    Which of the following factors can influence the fluidity of a biological membrane?

    <p>All of the above</p> Signup and view all the answers

    What is the primary function of lipid rafts in the cell membrane?

    <p>To serve as platforms for the organization and regulation of membrane proteins</p> Signup and view all the answers

    Which of the following statements about the structure of the cell membrane is correct?

    <p>The cell membrane is a fluid mosaic structure with proteins embedded in a phospholipid bilayer</p> Signup and view all the answers

    Which of the following membrane components is primarily responsible for establishing intercellular communication?

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

    Which of the following statements about the carbohydrate fraction of the cell membrane is correct?

    <p>The carbohydrate fraction is involved in cell-cell recognition and adhesion</p> Signup and view all the answers

    Which statement about biological membranes is incorrect?

    <p>They are rigid structures that do not allow changes in cellular shape or morphology.</p> Signup and view all the answers

    The plasma membrane is described as having a characteristic 'railroad track' appearance due to:

    <p>The presence of two polar layers, consistent with the phospholipid bilayer structure.</p> Signup and view all the answers

    What is the approximate width of the plasma membrane, according to the text?

    <p>$75 \AA$ (Angstroms)</p> Signup and view all the answers

    Which of the following is not a function of biological membranes?

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

    What technique is used to obtain the characteristic 'railroad track' appearance of the plasma membrane?

    <p>Cryofracture of cells and electron microscopy</p> Signup and view all the answers

    What is the approximate conversion factor between Angstroms (Å) and nanometers (nm)?

    <p>$1 \AA = 0.1 \text{nm}$</p> Signup and view all the answers

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