CAIE A Level Biology 9700 · Inheritance
The table below shows the relative activity of β-galactosidase in a bacterial strain grown under two conditions.
| Growth condition | β-galactosidase activity (arbitrary units) |
|---|---|
| Without lactose | 2 |
| With lactose | 100 |
Outline the genetic control of protein production in prokaryotes, using the data in the table and your knowledge of the lac operon. Then outline how transcription factors control gene expression in eukaryotes, using gibberellin signalling as an example.
7 marks, so the mark scheme is looking for about 7 separate creditworthy points. Making the same point twice in different words earns it once.
Outline means: Give the main points briefly. Less detail than describe, but every key step has to be there. One short line per step, in order. The marks are for coverage, not depth.
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