Cell Cycle Control and Mutations in Tumor Suppressor Genes Quiz
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Questions and Answers

What is the function of CDC25 in the cell cycle?

  • Phosphorylates CDK1
  • Inhibits MPF
  • De-phosphorylates CDK1 (correct)
  • Activates MPF

What role does Maturation-Promoting Factor (MPF) play in the cell cycle?

  • Regulates protein synthesis in the G1 phase
  • Inhibits cell division in the G2 phase
  • Stimulates both mitosis and meiosis (correct)
  • Triggers DNA replication in the S phase

Which subunit of Maturation-Promoting Factor (MPF) uses ATP to add phosphate groups to specific serine and threonine residues on target proteins?

  • Ubiquitin ligase
  • Cyclin
  • CDK1 (correct)
  • Wee1

Which term is often used to describe MPF due to its precise phosphorylation of target proteins during mitosis?

<p>M Phase Kinase (A)</p> Signup and view all the answers

How do mutations in tumor suppressor genes impact cell cycle control?

<p>Lead to uncontrolled cell division (C)</p> Signup and view all the answers

What is the function of the inhibitory enzyme Wee1 in the cell cycle?

<p>Phosphorylates CDK1 at a specific tyrosine residue (B)</p> Signup and view all the answers

Which specific sequence in cyclins leads to their destruction when recognized by the ubiquitin ligase enzyme?

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

What is the role of proto-oncogenes in cell proliferation?

<p>Promote cell growth (C)</p> Signup and view all the answers

What is the primary function of Cyclin-Dependent Kinase 1 (CDK1) in the cell cycle?

<p>Adding phosphate groups to target proteins (C)</p> Signup and view all the answers

Which gene product is associated with monitoring DNA damage as a tumor suppressor gene?

<p>p53 (C)</p> Signup and view all the answers

What happens when Maturation-Promoting Factor (MPF) is recognized by ubiquitin ligase?

<p>It leads to cyclin destruction when no longer needed (A)</p> Signup and view all the answers

What happens when CDK1 binds to cyclin B in the cell cycle?

<p>Activates MPF (D)</p> Signup and view all the answers

What is the main function of Maturation-Promoting Factor (MPF) in the cell cycle?

<p>Controls entry into mitosis (D)</p> Signup and view all the answers

Which protein components make up Maturation-Promoting Factor (MPF)?

<p>Cyclin B and Cdc2 (A)</p> Signup and view all the answers

What is another name for Cyclin-dependent kinase 1 (Cdk1)?

<p>Cdc2 (D)</p> Signup and view all the answers

Which process is triggered by the activation of MPF in the cell cycle?

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

What can result from the loss of cell cycle control?

<p>Tumor formation (B)</p> Signup and view all the answers

What role do Tumor Suppressor Genes play in cell growth?

<p>Act as brakes in cell growth (D)</p> Signup and view all the answers

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