Advertisements
Advertisements
प्रश्न
Short Answer Question:
Explain the role of lactose in ‘Lac Operon’.
उत्तर
- 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 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 the repressor. So structural genes are repressed/inactivated again. This is negative feedback.
APPEARS IN
संबंधित प्रश्न
In lac operon, lactose acts as:
Explain the role of Lactose as an inducer in Lac-operon.
Give diagrammatic representation of Lac-operon in the presence of inducer.
Which of the following is NOT the part of an operon?
Which of the following is the function of promoter in lactose operon of Escherichia coli?
In E.coli, the lac operon gets switched on when ______.
Which enzyme will produce in a cell in which there is a nonsense mutation in the lac Y-gene?
Select the correct pair.
Which molecule does act as inducer molecule in lac operon?
In the medium where E. coli was growing, lactose was added, which induced the lac operon. Then, why does lac operon shut down some time after addition of lactose in the medium?
