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The lac operon is pivotal in molecular genetics as a model for studying gene regulation in prokaryotic organisms like Escherichia coli (E. coli). This operon comprises three structural genes—lacZ, lacY, and lacA—that coordinate the metabolism of lactose, a critical sugar in the bacterial diet.
This module will deepen your knowledge about bacterial gene expression and its regulatory systems.
What is the lac operon?
A cluster of genes responsible for lactose metabolism in E. coli, demonstrating gene regulation mechanisms.
What triggers the lac operon to express its genes?
The presence of allolactose, an isomer of lactose, acts as an inducer, triggering the expression of the lac operon genes.
What role does the lac repressor play in the lac operon?
The lac repressor binds to the operator to inhibit transcription in the absence of lactose or allolactose.
Click any card to reveal the answer
Q1
What does the lac operon primarily regulate?
Q2
Which protein binds to the operator in the absence of lactose?
Q3
What happens to the lac operon when lactose is present?
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