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
Explain gibberellin and gene activation using evidence from each question and mark scheme.
Genes have a role in determining the overall phenotype of an organism.
Dwarf plants also occur if the genes controlling growth are not activated (switched on).
Explain how DELLA proteins act as repressors preventing gene expression.
any three from:
1 (DELLA proteins) bind to, PIF / transcription factor ;
2 PIF / transcription factor, cannot bind to, DNA / promoter ;
3 RNA polymerase cannot bind to promoter ;
4 no transcription / mRNA not made ;