Contractile Assemblies and Non-Muscle Myosin II Quiz
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Questions and Answers

Which structure is responsible for the movement of microtubules in an axoneme?

  • Dynein (correct)
  • Nexins
  • Centrioles
  • Basal bodies
  • Which drug binds to tubulin and inhibits microtubule assembly?

  • Vincristine
  • Taxol
  • Colchicine (correct)
  • Vinblastine
  • What is the function of nexins in an axoneme?

  • Bending MTs
  • Movement
  • Structural integrity
  • Anchoring MTs (correct)
  • Which of the following is NOT a main type of cytoskeletal element?

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

    Which of the following is responsible for the continuous assembly and disassembly of microfilaments?

    <p>Actin Binding Proteins</p> Signup and view all the answers

    Which type of myosin is associated with non-muscle cells and is involved in cell motility?

    <p>Myosin II</p> Signup and view all the answers

    Which type of cytoskeletal component has a diameter of 10 nm?

    <p>Intermediate Filaments</p> Signup and view all the answers

    What is the main function of the Arp 2/3 complex?

    <p>F-actin branching</p> Signup and view all the answers

    Which end of F-actin grows at a faster rate?

    <p>Plus (+) end</p> Signup and view all the answers

    What is the molecular basis of movement in cilia and flagella?

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

    Which protein is a key intermediate filament protein of the cytoskeleton in cardiac and skeletal muscle?

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

    Which type of cell tumors can be identified using specific antibodies for immunohistochemistry?

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

    What is the basic structural unit of microtubules?

    <p>Tubulin heterodimer</p> Signup and view all the answers

    Which type of microtubule-dependent ATPases carry cargo outward towards the plus end of microtubules?

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

    Which motor protein is present in all cell types and interacts with F-actin to generate force or translocate molecules and organelles?

    <p>Myosin II</p> Signup and view all the answers

    Which class of myosin contains traditional or conventional myosins such as skeletal and heart muscle myosin, smooth muscle myosin, and non-muscle myosin?

    <p>Myosin II</p> Signup and view all the answers

    Which domain of myosin heavy chains (MHC) contains the ATPase activity?

    <p>Motor (head) domain</p> Signup and view all the answers

    What happens to myosin activity when the regulatory light chains (RLC) are phosphorylated?

    <p>Increases ATPase activity in MHC motor domain</p> Signup and view all the answers

    Which of the following is true about the contractile ring during mitosis?

    <p>It is connected to the cell membrane</p> Signup and view all the answers

    What is the main function of intermediate filaments?

    <p>To provide mechanical support and structural integrity to the cell</p> Signup and view all the answers

    Which of the following is true about Myosin I?

    <p>It moves along microfilaments toward the minus end</p> Signup and view all the answers

    What is the consequence of F-actin polymerization being faster than sliding of F-actin toward the minus ends?

    <p>The cell moves forward</p> Signup and view all the answers

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