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The region of lac operon which must be free (unbound) for the structural gene transcription to occur is
The region of lac operon which must be free (unbound) for the structural gene transcription to occur is
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Solution
The correct option is B Operator
Promotor is a DNA segment that serves to initiate transcription of a particular gene. They are present upstream near the transcription start sites of genes. Operator is a DNA sequence present between the promoter region and the first coding gene. A regulator gene regulates the expression of structural genes by its protein product that are mostly transcription factors. These transcription factors, the regulatory protein, bind to the operator region which is located just upstream the binding site of the RNA polymerase and hence, prevent the binding and transcription.Thus, operator region serves as repressor protein binding site which must be free (unbound) for the structural gene transcription to occur. Correct option is A.
Promotor is a DNA segment that serves to initiate transcription of a particular gene. They are present upstream near the transcription start sites of genes. Operator is a DNA sequence present between the promoter region and the first coding gene. A regulator gene regulates the expression of structural genes by its protein product that are mostly transcription factors. These transcription factors, the regulatory protein, bind to the operator region which is located just upstream the binding site of the RNA polymerase and hence, prevent the binding and transcription.Thus, operator region serves as repressor protein binding site which must be free (unbound) for the structural gene transcription to occur. Correct option is A.
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