CAIE A-Level Biology A2 16.3.5 Gibberellin and Gene Activation Questions
Explain gibberellin and gene activation using evidence from each question and mark scheme.
- Syllabus
- 2028–2030
- Course
- Biology 9700
- Level
- A2
Exam points
- Explain gibberellin and gene activation.
CAIE A-Level Biology A2 16.3.5 Gibberellin and Gene Activation Questions question 1
[Maximum number: 4]
Control of gene expression in eukaryotes is more complex than in prokaryotes.
In plants, the control of gene expression can involve plant hormones, such as gibberellin, and proteins known as JAZ and MYC.
Describe how gibberellin activates genes in plant cells.
any four from:
1 (gibberellin) binds to receptor ;
2 ref. enzyme ;
3 (enzyme causes) DELLA breakdown ;
4 DELLA no longer, binds to / inhibits, transcription factor / PIF ;
5 (so) transcription factor / PIF / RNA polymerase, binds to, DNA / promoter ;
6 (growth) genes, switched on / expressed / transcribed ;
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