In the lac operon, the structural genes are switched off when [Kerala CET 2005]
A) Repressor binds to operator
B) Repressor binds to promotor
C) Repressor binds to regular
D) Repressor binds to inducer
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its B) represor binds to promotor
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hope help..
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The correct answer is option A, that is, repressor binds to the operator.
The lac operon refers to an operon, or an array of genes with a solitary promoter, transcribed as a single mRNA. The genes in the operon encode proteins, which permits the bacteria to utilize lactose as a source of energy.
In the lac operon, the structural genes are switched off when the repressor binds with a short sequence of DNA, that is, operator, inhibiting RNA polymerase from combining with the promoter. This is known as on/off switch of transcription.
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