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Yeast has been especially valuable for studying the cell cycle because it

  • A.is the only known organism with cyclin proteins
  • B.is a eukaryote that grows and mutates readily
  • C.has no cell cycle checkpoints of its own at all
  • D.divides without ever replicating any of its DNA

Answer: B

Temperature-sensitive mutants that arrest at particular points allowed the genes to be identified one by one. Many of those genes turned out to have close human counterparts. Work in yeast therefore illuminated human cancer directly.

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