Cytoskeleton Structure and Function Quiz
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Questions and Answers

What is the function of motor proteins in cells?

  • Creating lateral arms linking actin to the plasma membrane
  • Regulating microtubule structure and function
  • Binding to a polarized cytoskeletal filament and using ATP to move along it (correct)
  • Stabilizing microtubules in axons

Which motor protein is involved in forming lateral arms linking actin to the plasma membrane?

  • Myosin I (correct)
  • Dyneins
  • Kinesins
  • Myosin II

What is the major function of Microtubule Associated Proteins (MAPs)?

  • Stabilizing microtubules in axons
  • Regulating microtubule structure and function (correct)
  • Forming lateral arms linking actin to the plasma membrane
  • Providing cellular movement

Where is the Centrosome, a Microtubule Organizing Center (MTOC), located?

<p>Consists of two centrioles in a matrix of accessory proteins (B)</p> Signup and view all the answers

Which microtubules are directly involved in the separation of chromosomes during cell division?

<p>Kinetochore microtubules (B)</p> Signup and view all the answers

What is a major difference between Actin Filaments and Microtubules in terms of their structure?

<p>Microtubules have GTP/GDP bound nucleotides while Actin Filaments undergo nucleotide hydrolysis (C)</p> Signup and view all the answers

What is the primary function of actin filaments in the cytoskeleton?

<p>Structural support and motility (D)</p> Signup and view all the answers

Which of the following statements about actin filaments is true?

<p>They are polar structures (C)</p> Signup and view all the answers

What is the primary function of the cross-linking protein fimbrin?

<p>Organizing actin filaments into tight, parallel bundles in microspikes and filopodia (B)</p> Signup and view all the answers

Which of the following actin networks is specialized for sensing sound in the ear?

<p>Stereocilia (A)</p> Signup and view all the answers

Which of the following actin gene families is primarily expressed in non-muscle tissues?

<p>Non-muscle tissue (B)</p> Signup and view all the answers

What is the diameter of intermediate filaments in the cytoskeleton?

<p>10 nm (C)</p> Signup and view all the answers

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