1. (a) Lactose levels are high Lac Operon Genes are switched OFF Lac Operon Genes are switched ON Does NOT affect the gene expression (b) Enhancer and activator proteins are working together Gene is switched ON Gene is switched OFF Does NOT affect the gene expression

Biochemistry
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Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
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Chapter1: Biochemistry: An Evolving Science
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1. (a) 

Lactose levels are high
   
Lac Operon Genes are switched OFF
   
Lac Operon Genes are switched ON
   
Does NOT affect the gene expression
(b)
Enhancer and activator proteins are working together
   
Gene is switched ON
   
Gene is switched OFF
   
Does NOT affect the gene expression
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