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Cyclin B is chiefly associated with

  • A.the initiation of DNA replication
  • B.the decision to enter G0
  • C.entry into mitosis
  • D.passage through the restriction point

Answer: C

Together with its kinase it forms the factor that drives a cell into division, and its destruction at anaphase allows the cell to exit mitosis again. The rise and fall is one of the clearest oscillations in the cycle. Its discovery in sea urchin eggs gave the cyclins their name.

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