NEETBiologyMolecular Basis of InheritanceMCQ+4 / −1
In an E. Coli strain i gene gets mutated and its product can not bind the inducer molecule. If growth medium is provided with lactose, what will be the outcome?
- AOnly z gene will get transcribed
- Bz, y, a genes will be transcribed
- Cz, y, a genes will not be translated
- DRNA polymerase will bind the promoter region
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Correct answer: C
As the product of 'i' gene binds with the operator region and blocks the transcription and translation of z, y and a genes.
It's product is prevented from binding to the operator by attaching it with the inducer. As the inducer can not no more capable of binding with the repressor, thus, in all the cases, operator always gets attached with the repressor thereby preventing the transcription and transmission of z, y and a.
Even in the presence of lactose, transcription and translation of z, y and a would not occur.
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