Explain the role of regulatory gene, operator promoter and structural

1.	Explain the role of regulatory gene, operator promoter and structural genes in lac operon when E. Coli is growing in a culture medium with the source of energy as lactose.
Answer» An operon is a part of DNA that functions as a gene regulatory unit in transcription. (a) Regulatory gene : This gene controls the operator gene. This produces a protein substance known as represser which combines with the operator gene to stop its function. (b) Operator : It controls the functioning of structural genes which are expressed when operate, gene is turned on by inducer and not expressed when operates is turned off by repressor. (c) Promoter : It is the site at which the RNA polymerase binds and reaches the structural genes for the transcription of mRNA to start. (d) Structural genes : These genes produce mRNA which synthesize the specific proteins such as enzyme regained for metabolism of Lactose.

Explain the role of regulatory gene, operator promoter and structural genes in lac operon when E. Coli is growing in a culture medium with the source of energy as lactose.

Answer»

An operon is a part of DNA that functions as a gene regulatory unit in transcription.

(a) Regulatory gene : This gene controls the operator gene. This produces a protein substance known as represser which combines with the operator gene to stop its function.

(b) Operator : It controls the functioning of structural genes which are expressed when operate, gene is turned on by inducer and not expressed when operates is turned off by repressor.

(c) Promoter : It is the site at which the RNA polymerase binds and reaches the structural genes for the transcription of mRNA to start.

(d) Structural genes : These genes produce mRNA which synthesize the specific proteins such as enzyme regained for metabolism of Lactose.

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