Wild type $E. coli$ cells are growing in a normal medium with glucose. They are transferred to a medium containing only lactose as the sugar. Which one of the following changes takes place?

  • A
    The $lac$-Operon is repressed
  • B
    All Operons are induced
  • C
    $E. coli$ cells stop dividing
  • D
    The $lac$-Operon is induced

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