Adherens Junctions in Cell Interactions
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Questions and Answers

What is the role of cadherins in adherens junctions?

  • Contracting actin filaments
  • Facilitating the formation of tight junctions
  • Serving as transmembrane adhesion proteins (correct)
  • Maintaining the integrity of intracellular anchor proteins
  • In epithelial cells, where do the adhesion belts typical of adherens junctions form?

  • Inside the cytoplasm
  • Around each interacting cell in the sheet (correct)
  • Just above the tight junctions
  • At the nucleus
  • How are the actin bundles linked within the extensive transcellular network in adherens junctions?

  • Via cadherins and anchor proteins (correct)
  • Via integrins
  • By desmosomes
  • Through gap junctions
  • What is the orientation of the contractile bundle of actin filaments relative to the plasma membrane in adherens junctions?

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

    What is the proposed role of the transcellular network in animal morphogenesis mentioned in the text?

    <p>Mediating folding of epithelial cell sheets into tubes</p> Signup and view all the answers

    What is the primary function of adherens junctions in nonepithelial tissues?

    <p>Directly connect the cortical actin filaments of two interacting cells</p> Signup and view all the answers

    What is the role of catenins, vinculin, and α-actinin in adherens junctions?

    <p>Anchor the actin filaments to the plasma membrane</p> Signup and view all the answers

    How does the transcellular network in adherens junctions contract?

    <p>With the help of myosin motor proteins</p> Signup and view all the answers

    Where do prototypical examples of adherens junctions typically occur?

    <p>In epithelia as continuous adhesion belts below tight junctions</p> Signup and view all the answers

    What is the role of desmosomes in cells?

    <p>Serve as anchoring sites for intermediate filaments</p> Signup and view all the answers

    Why do the particular type of intermediate filaments attached to desmosomes vary among cell types?

    <p>Depending on the tissue, different types of intermediate filaments are needed</p> Signup and view all the answers

    How do desmosomes contribute to the overall structure of tissues?

    <p>By forming a network that connects all cells within a tissue</p> Signup and view all the answers

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