Inglise keel unit 5 answers
3. 1 ref to operon;
2 normally repressor substance bound to operator;
3 prevents RNA polymerase binding (at promoter) / prevents
transcription;
4 lactose binds to repressor;
5 changes shape of protein molecule;
6 unable to bind (to operator);
7 RNA polymerase binds (at promoter) / transcription occurs / genes
switched on;
8 AVP; e.g. production of lactose permease / production of beta-
galactosidase; max 5
[5]
4. a change in the genetic material;
unpredictable / AW;
extra detail; e.g. addition / substitution / deletion / frame shift / small
part of chromosome / may code for different protein /
may code for no protein
annaabi.ee 
