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Question
Explain the role of Lactose as an inducer in Lac-operon.
Solution
- A few molecules of lactose enter into the cell by an enzyme permease.
- A small amount of this enzyme is present even when the operon is switched off.
- A few molecules of lactose, act as an inducer and bind to the repressor.
- This repressor–inducer complex fails to join with the operator gene, which is then turned on.
- Structural genes produce all enzymes. Thus, lactose acts as an inducer of its own breakdown.
- When the inducer level falls, the operator is blocked again by a repressor. So structural genes are repressed/inactivated again. This is negative feedback.
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RELATED QUESTIONS
Multiple Choice Question:
Which out of the following is not an example of an inducible operon?
Short Answer Question:
Describe the structure of ‘Operon’.
Which of the following gene is responsible for the synthesis of repressor in operon?
The wild type E. coli cells are growing in normal medium with glucose. They are transferred to a medium containing only lactose as sugar. Which of the following changes takes place?
During expression of an operon, RNA polymerase binds to ______.
The sequence of structural genes in lac operon is ______.
Which of the following cannot act as inducer?
Which of the following is required as an inducer(s) for the expression of lac operon?
Explain the components of the structural genes in the Lac operon system in E.coli.
How does the operon function in the presence of lactose?
