• The cell cycle in prokaryotes is quite simple: the cell grows, its DNA replicates, and the cell divides.
  • In eukaryotic cells there are two growth phases, and cell division and mitosis.
  • The cell cycle is controlled mainly by regulatory proteins.
  • These proteins control the cycle by signaling the cell to either start or delay the next phase of the cycle.
  • Cancer is a disease that occurs when the cycle is no longer regulated and may form a mass of abnormal cells called a tumor.
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