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When lactose is present in E - VCE - SSCE Biology - Question 4 - 2017 - Paper 1
Question 4
When lactose is present in E. coli; the lactose molecules are rearranged to become allolactose molecules. Following this rearrangement, the structural genes in the l... show full transcript
Worked Solution & Example Answer:When lactose is present in E - VCE - SSCE Biology - Question 4 - 2017 - Paper 1
Step 1
C. repressor molecules bind to allolactose.
Answer
The presence of allolactose in E. coli leads to the binding of repressor molecules to allolactose itself. This binding causes a conformational change in the repressor that disables its ability to bind to the operator region of the lac operon. Consequently, the transcription of structural genes in the operon is initiated, allowing for the metabolism of lactose.