Cell Division: Stages and Control Points

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Questions and Answers

What is the main function of cell division?

  • Regulate cell size
  • Break down nutrients for cellular metabolism
  • Generate energy for the cell
  • Produce new cells for growth and repair (correct)

What is the role of Cdc25 mutant in cell division?

  • Promotes cell division (correct)
  • Halts the cell cycle
  • Inhibits cell division
  • Controls DNA replication

Which enzyme is critically controlled by cyclin dependent kinases during the cell cycle?

  • Wee1 (correct)
  • Proteasome
  • Cdc25
  • Ubiquitin ligase

What complex conjugates onto proteins during cell division?

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

Which process allows cdk to be activated at the right time for successful cell division?

<p>Phosphorylation/dephosphorylation (B)</p> Signup and view all the answers

What is the distinctive feature of the Wee1 mutant in the context of cell division?

<p>Controls cyclin:cdk complexes (B)</p> Signup and view all the answers

What is the role of cyclin dependent kinase inhibitors during the cell cycle?

<p>Inducing transcription of inhibitors if conditions are not right for cell division (C)</p> Signup and view all the answers

Which protein is responsible for holding sister chromatids together during anaphase?

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

What happens if chromosomes are not properly attached and under tension during metaphase?

<p>Mitosis cannot proceed (D)</p> Signup and view all the answers

Which checkpoint ensures that chromosomes are correctly attached before entering anaphase?

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

What can defects in genes required to pass the R point lead to?

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

Which protein is degraded for mitotic exit to occur?

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

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