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D2.2.11 (HL)—External factors Topic Practice

D2.2.11 (HL)—External factors Topic Practice
IB Biology syllabusBiology SL/HLFirst assessment 2025

Students practise comparing hormonal regulation in eukaryotes with operon-based control in prokaryotes using concrete molecular mechanisms.

How this is tested

  • compare steroid hormone
  • explain how external signals like lactose or tryptophan alter transcription factor activity or operon
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