Respuesta :
The lacI gene is transcribed in the absence of an inducer, such as allolactose or IPTG, and the resulting repressor protein binds Lac Operon when Inducers are present The inducer binds to the repressor during induction.
Escherichia coli's lactose operon is made up of three structural genes that code for proteins involved in lactose metabolism as well as DNA regulatory sites for the operon.
In bacteria, many of the genes that code for proteins are grouped together in groups called operons, which work as transcriptional units that are coordinatedly controlled.
When it came to the regulation of transcription, the lac operon model was first put forth by Jacob and Monod in 1961.
Three components are suggested by the operon model:
a collection of structural genes, or genes that code for the proteins that will be regulated;
a DNA region called an operator site that controls the transcription of structural genes;
a protein that recognises the operator sequence is encoded by a regulator gene.
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