Biology NEET Previous Year Question Paper NEET 2022 Previous Year Question Paper Single Correct MCQ
Published on: August 14, 2026

In an E.coli strain i gene gets mutated and its product cannot bind the inducer molecule. If growth medium is provided with lactose, what will be the outcome?

A
Only zgene will get transcribed
B
z,y, a genes will be transcribed
C
z,y a genes will not be translated
D
RNA polymerase will bind the promoter region

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As the product of 'l' gene binds with the operator region and blocks the transcription and translation of z, y and a gene, its product is prevented from binding to the operator by attaching it with the inducer. As the inducer is no more capable of binding with the represser, thus, in all the cases, operator always gets attached with the represser 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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