OPERON MODEL OF GENE EXPRESSIO1

OPERON MODEL OF GENE EXPRESSIO1 - OPERON MODEL OF GENE...

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OPERON MODEL OF GENE EXPRESSION   This is a description of the details of the control of gene expression by induction and repression.  Induction of the enzymes involved in lactose catabolism in  Escherichia coli   can be used as the  example.    Three enzymes are needed for taking in and breaking down lactose. The genes for these enzymes  are located next to each other on the bacterial chromosome. If one of the enzymes is needed, all  of them are. If no lactose is present, none of the enzymes are needed, so the  enzymes are  regulated together. These genes, which determine the structures of proteins, are known as  structural genes.    Associated with the three structural genes are two segments of DNA which make up the control  region.  One segment is the promoter, which is the region of DNA where RNA polymerase  initiates transcription. The other is the operator, which can be described as a traffic light, acting 
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OPERON MODEL OF GENE EXPRESSIO1 - OPERON MODEL OF GENE...

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