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Cell Biology 1st Year CCNLS 2023/2024: Cytoskeleton Chapter Quiz
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Cell Biology 1st Year CCNLS 2023/2024: Cytoskeleton Chapter Quiz

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Questions and Answers

Which process is essential for a variety of cellular functions, including cell motility, cell division, and cell shape maintenance?

  • Tubulin protein formation
  • Actin filament disassembly
  • Microfilament polymerization (correct)
  • Microtubule assembly
  • Where does polymerization occur most rapidly in an actin filament?

  • Pointed end
  • Barbed end (correct)
  • Middle portion
  • Both ends equally
  • Which structure forms a contractile ring that helps to divide the cytoplasm of the cell into two daughter cells?

  • Microtubule
  • Tubulin protein
  • Cortical cytoskeleton
  • Actin filament (correct)
  • What is the diameter of microtubules?

    <p>25 nm</p> Signup and view all the answers

    Which type of movement are microfilaments responsible for?

    <p>Crawling movement</p> Signup and view all the answers

    Which protein is known for its high tensile strength and resistance to pulling forces in the extracellular matrix?

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

    Which type of collagens are made up of triple helical monomers of either identical or different subunits?

    <p>Fibrillar collagens</p> Signup and view all the answers

    What distinctive type of protein-polysaccharide complex is typically found in basement membranes and other extracellular matrices?

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

    Which molecule forms gigantic complexes with proteoglycans in the extracellular matrix?

    <p>Hyaluronic acid</p> Signup and view all the answers

    What type of subunits are joined by a pair of disulfide bonds near the C-terminal to form fibronectin?

    <p>Polypeptide subunits</p> Signup and view all the answers

    What is the main function of the extracellular matrix (ECM) in a multicellular organism?

    <p>Regulating the shape and activities of the cell</p> Signup and view all the answers

    How does the structure of proteins in the extracellular space differ from those inside the cells?

    <p>Proteins inside the cells tend to be extended and fibrous, whereas those in the extracellular space are usually compact and globular</p> Signup and view all the answers

    In what way does the extracellular matrix (ECM) differ from an inert packing material or nonspecific glue?

    <p>It determines the shape and activities of the cell</p> Signup and view all the answers

    Which term best describes the macromolecular organization of the extracellular matrix?

    <p>Extended and fibrous</p> Signup and view all the answers

    What term is commonly used to describe the network of extracellular materials that is present beyond the immediate vicinity of the plasma membrane?

    <p>Extracellular matrix (ECM)</p> Signup and view all the answers

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