BiologyCode 9700
Gene control
What this topic asks you to be able to do
- describe how structural genes and regulatory genes differ, and how repressible enzymes differ from inducible enzymes
- explain how protein production is genetically governed in a prokaryote, drawing on the lac operon
- state that, in eukaryotes, gene expression is controlled partly by transcription factors: proteins that bind to DNA and raise or lower the rate at which transcription happens
- explain how gibberellin activates genes: it causes DELLA protein repressors to be broken down, and these repressors would otherwise inhibit the factors that promote transcription