CUET · BIOLOGY · PYQ PAPER 2025
The production of beta-galactosidase by the lac operon is started when:
- A Lactose binds to the repressor protein and inactivate it, thus RNA polymerase gets access to the promoter and then transcription proceeds where y gene codes for beta-galactosidase.
- B Lactose binds to the repressor protein and inactivate it, thus RNA polymerase gets access to the promoter and then transcription proceeds where z gene codes for beta-galactosidase.
- C Lactose binds to the repressor protein and inactivate it, thus RNA polymerase gets access to the promoter and then transcription proceeds where a gene codes for beta-galactosidase.
- D Lactose binds to promoter and activate it, thus RNA polymerase gets full access to the promoter and then transcription proceeds where z gene codes for beta-galactosidase.
Answer & Solution
Correct Answer
(B) Lactose binds to the repressor protein and inactivate it, thus RNA polymerase gets access to the promoter and then transcription proceeds where z gene codes for beta-galactosidase.
Step-by-step Solution
Detailed explanation
Lactose binds to the repressor protein and inactivate it, thus RNA polymerase gets access to the promoter and then transcription proceeds where z gene codes for beta-galactosidase.
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