Actin Protein and Polymerization Quiz
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Questions and Answers

What is the molecular weight of actin?

  • 40kDa (correct)
  • 30kDa
  • 60kDa
  • 50kDa
  • During actin polymerization, what is the critical concentration (Cc) defined as?

  • The concentration of ATP required for hydrolysis
  • The concentration at which the rate of subunit addition and loss are equal (correct)
  • The concentration of G-actin needed for nucleation
  • The concentration of Mg2+ ions required for filament formation
  • What provides the energy required for adding actin subunits onto the filament during elongation phase?

  • Mg2+ ion
  • Pi
  • ADP
  • ATP (correct)
  • How many protofilaments are alpha and beta tubulin molecules arranged in to form tubules?

    <p>13</p> Signup and view all the answers

    What type of nucleotide provides energy for dimer binding in tubulin polymerization?

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

    Actin polymerization occurs in three phases: nucleation, elongation, and steady phase.

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

    During the nucleation phase, G-actin subunits collide with each other and weakly associate to form oligomers.

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

    The critical concentration (Cc) is higher when there is a higher concentration of actin subunits and more frequent collisions.

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

    Tubulin forms heterodimers composed of alpha and beta tubulin molecules.

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

    Tubulin dimers stick together with the use of nucleotide ATP, which provides energy for the polymerization process.

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

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