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STD 12 - 5. molecular basis of inheritance — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - 5. molecular basis of inheritance4 Marks
MCQ
In Escherichia coli, lac operon is induced by
  • ✓
    $lactose$
  • B
    $promotor\; gene$
  • C
    $b-galactosidase$
  • D
    $I-gene$
✓

Answer

Correct option: A.
$lactose$
a
The inducer for Lac operon of Escherichia coli is lactose (actually allolactose or metabolite of Lactose). This lac operon normally remains inactive. When lac operon contacts with lactose, the lactose acts as an inducer and combines with the repressor, and the repressor is detached from operator gene. Thus $RNA$ - repressor, and the repressor is detached from operator gertural genes and polymerase enzyme gets its passage and reaches to the structural starts the transcription.

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