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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: 2]

The lac operon of prokaryotes contains a group of structural genes that are under the same control and are transcribed together.

Another operon found in prokaryotes is the trp operon.
Fig. 6.1 summarises the structure and control of the trp operon.

Fig. 6.1

Fig. 6.1

trp⁡A\operatorname{trp} A codes for the enzyme tryptophan synthase.

Tryptophan synthase catalyses the formation of the amino acid tryptophan.
Explain why tryptophan synthase is an example of a repressible enzyme.

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