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प्रश्न
Multiple Choice Question:
Which out of the following is not an example of an inducible operon?
विकल्प
Lactose operon
Histidine operon
Arabinose operon
Tryptophan operon
उत्तर
Tryptophan operon
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संबंधित प्रश्न
Name the components of lac operon and discuss their role.
In lac operon, lactose acts as:
What is meant by an operon?
Give diagrammatic representation of Lac-operon in the presence of inducer.
With respect to lac- operon explain the following terms:-
- regulator gene
- promoter gene
- structural gene
- inducer
In which of the following conditions the lac operon in E. coli becomes "switched on"?
Match the Column I (Enzymes) with Column II (Functions) and select the correct option.
|
Column I (Enzymes) |
Column II (Functions) |
||
| i. | Permease | P. | Transfers an acetyl group from acetyl CO-A to galactoside |
| ii. | β-galactosi dase | Q. | Entry of lactose into the cell |
| iii. | Transacetylase | R. | Digests lactose into galactose and glucose |
| S. | Aminoacylation |
Lac operon consists of ______.
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.
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) The active site of enzyme permease present in the cell membrane of a bacterium has been blocked by an inhibitor, how will it affect the lac operon?
(b) The protein produced by the i gene has become abnormal due to unknown reasons. Explain its impact on lactose metabolism stating the reason.
(c) If the nutrient medium for the bacteria contains only galactose; will operon be expressed? Justify your answer.
