A-Level Biology OCR A
Lac Codes Transcription Operon Regulatory Structural Lactose Binding
| Front |
Draw and label a diagram to show the lac operon and its associated regulatory gene. |
| Back |
Lac operon:
Structural genes: - lacZ - codes for beta galactosidase (hydrolyses lactose)
- lacY - codes for lactose permease (facilitates passage of lactose into cell)
- lacA - codes for transacetylase (not fullly understood)
Control sites: - Promoter - RNA polymerase binding site to allow transcription
- Operator - transcription factor binding site, switches structural genes on/off
Regulatory gene: (lacI) - Not part of the operon
- Codes for transcription factor (repressor protein)
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A-Level Biology OCR A