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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