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Title: The catabolite repression system in E. coli essentially represses the lac operon Post by: colleen on Sep 21, 2013 The catabolite repression system in E. coli essentially represses the lac operon when glucose is present. What evolutionary advantage would favor evolution of such a system?
Title: Re: The catabolite repression system in E. coli essentially represses the lac operon Post by: savio on Sep 26, 2013 Glucose can enter glycolysis "as is," whereas lactose must first be split into glucose and galactose. To do so, the energy-requiring synthesis of β-galactosidase is required. It is more energy efficient to burn glucose than lactose.
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