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Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYMolecular Basis of Inheritance2 Marks
Question
Study the figure given below and answer the questions:
  1. How does the repressor molecule get inactivated?
  2. When does the transcription of lac mRNA stop?
  3. Name the enzyme transcribed by the gene 'z'.
✓

Answer

  1. When the inducer binds to the repressor, the repressor is inactivated.
  2. The transcription stops when lactose becomes exhausted, i.e. when the repressor is free to bind to the operator or when there is no need for energy to the cells.
  3. B-galactosidase.

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