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CAIE A-Level Biology 16.3 Gene Control Question Bank

Practise gene-control questions by explaining operons, repressors, transcription factors and hormone signals that switch genes on, off or change transcription rates.

Syllabus
2028–2030
Course
Biology 9700
Level
A2

Exam points

  • compare structural and regulatory genes by their products and effects on transcription
  • interpret lac operon data using lacI, repressor, operator, lactose or IPTG changes
  • explain eukaryotic gene control through transcription factors, promoters and DELLA breakdown

Covered syllabus points

16.3.1—Structural genes vs regulatory genes16.3.2—Repressible enzymes vs inducible enzymes16.3.3—Genetic control in prokaryotes16.3.4—Transcription factors in eukaryotes16.3.5—Gibberellin and gene activation

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