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MODEL PAPER 2025 — BIOLOGY STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceBIOLOGYMODEL PAPER 20251 Mark
MCQ
In E.coli, the lac operon gets switched on when lactose is
  • ✓
    present in the medium and it binds to the repressor.
  • B
    not present in the medium and the repressor binds to the operator.
  • C
    not present in the medium and RNA polymerase binds to the operator.
  • D
    Active lactose present in the medium binds to RNA polymerase.
✓

Answer

Correct option: A.
present in the medium and it binds to the repressor.
present in the medium and it binds to the repressor.

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