IB Biology HL D2.2.11 Hl External Factors Questions
Analyse how an external lactose signal changes repressor binding, promoter access and enzyme production in IB Biology HL D2.2.11.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Explain how lactose binding to the lac repressor releases promoter access for RNA polymerase, allowing lactase-gene transcription when lactose is present and suppressing it when absent.
IB Biology HL D2.2.11 Hl External Factors Questions question 1
The diagram shows a nucleosome from the nucleus of a eukaryotic cell.
Explain the role of lactose in the expression of the gene for lactase production.
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