CAIE A-Level Biology A2 16.3.2 Repressible Enzymes Vs Inducible Enzymes Questions
Distinguish repressible enzymes from inducible enzymes using evidence from each question and mark scheme.
- Syllabus
- 2028–2030
- Course
- Biology 9700
- Level
- A2
Exam points
- Distinguish repressible enzymes from inducible enzymes.
CAIE A-Level Biology A2 16.3.2 Repressible Enzymes Vs Inducible Enzymes Questions question 1
[Maximum number: 3]
Gene expression in a cell is controlled. When a gene is expressed (switched on), the gene is transcribed. When a gene is not expressed (switched off), the gene is not transcribed.
Environmental changes can cause some genes to be switched on or switched off.
The lac operon codes for inducible enzymes. Repressible operons code for repressible enzymes.
Suggest and explain why it is an advantage to a prokaryote to have a repressible operon.
1 enzymes / proteins, made continuously / all the time ;
2 (because) enzymes / proteins, needed / necessary (for cell) ;
3 end product inhibition / made until product concentrations too high ;
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