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CAIE A Level Biology 9700 · Inheritance

Inheritance: describe question

Describe6 marksChallenge

Describe the differences between inducible and repressible enzyme systems in the control of gene expression. In your answer you should include:

  • the roles of structural genes and regulatory genes
  • the mechanism of the lac operon in E. coli as an example of an inducible system
  • the function of transcription factors in eukaryotes
  • how gibberellin activates gene expression in plants
0 words · 6 marks

No account needed for your first marks. Your answer is used only to mark it.

How this question is marked

6 marks, so the mark scheme is looking for about 6 separate creditworthy points. Making the same point twice in different words earns it once.

Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.

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