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Question
lac operon is
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Solution
The correct option is A Inducible operon
lac operon
The lac operon is responsible for the transport and metabolism of lactose in bacteria like E. coli.
Arabinose operon
Arabinose operon is also an inducible operon present in E. coli which is responsible for the production of five-carbon sugar, arabinose.
Repressible operon
Repressible operon is the operon which remains in a switched on condition. It switches off only when repressor protein is activated in the presence of the metabolite.
Example: Trp operon is a repressible operon.
Inducible operon
An inducible operon system is the one which remains in a switched off condition, It gets activated only when the substance to be metabolised (inducer) is present in the cell that inactivates the repressor.
For example, the lac operon is an inducible operon system which begins to work when lactose or allolactose (an inducer) is present in the cell.
Overlapping genes
Overlapping genes are DNA segments whose coding nucleotide sequences are partially overlapped with that of other genes. This results in two different reading frames during translation and leads to the formation of two proteins from the same sequence.
Final answer
(C) Inducible operon
lac operon
The lac operon is responsible for the transport and metabolism of lactose in bacteria like E. coli.
Arabinose operon
Arabinose operon is also an inducible operon present in E. coli which is responsible for the production of five-carbon sugar, arabinose.
Repressible operon
Repressible operon is the operon which remains in a switched on condition. It switches off only when repressor protein is activated in the presence of the metabolite.
Example: Trp operon is a repressible operon.
Inducible operon
An inducible operon system is the one which remains in a switched off condition, It gets activated only when the substance to be metabolised (inducer) is present in the cell that inactivates the repressor.
For example, the lac operon is an inducible operon system which begins to work when lactose or allolactose (an inducer) is present in the cell.
Overlapping genes
Overlapping genes are DNA segments whose coding nucleotide sequences are partially overlapped with that of other genes. This results in two different reading frames during translation and leads to the formation of two proteins from the same sequence.
Final answer
(C) Inducible operon
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