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प्रश्न
A low level of expression of lac operon occurs at all the time. Can you explain the logic behind this phenomena.
उत्तर
In the complete absence of expression of lac operon, permease will not be synthesised which is essential for transport of lactose from medium into the cells. And if lactose cannot be transported into the cell, then it cannot act as inducers hence, cannot relieve the lac operon from its repressed state.
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संबंधित प्रश्न
Study the schematic representation of the genes involved in the lac operon given below and answer the questions that follow :
| p | i | p | o | z | y | a |
(a) Identify and name the regulatory gene in this operon. Explain its role in 'switching off' the operon.
(b) Why is the lac operon's regulation referred to as negative regulation?
(c) Name the inducer molecule and the products of the genes 'z' and 'y' of the operon. Write the functions of these gene products.
Multiple Choice Question:
Which out of the following is not an example of an inducible operon?
Long Answer Question:
Describe the ‘Lac-operon’.
Give diagrammatic representation of Lac-operon in the presence of inducer.
Which of the following is the function of promoter in lactose operon of Escherichia coli?
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?
Assertion (A): Regulation of lac operon by a repressor is referred to as negative regulation.
Reason (R): Lac operon is under the control of positive regulation as well.
In lac operon system, gene - z codes for ______.
What is the role of a repressor gene?
How does the operon function in the presence of lactose?
