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Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceBIOLOGYMolecular Basis of Inheritance3 Marks
Question
Study the figure given below and answer the following questions.
  1. Name the molecule 'X' synthesised by i gene. How does this molecule get inactivated?
  2. Which one of the structural genes codes for B-galactosidase?
  3. When will the transcription of this gene stop?
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Answer

  1. Molecule 'X' is a repressor protein. When an inducer combines with it, it is inactivated.
  2. 'z' gene.
  3. Transcription of gene stops.
  1. Substrate (lactose) is not available.
  2. Energy source (glucose) is available to the cells.

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