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1. in lac operon; gene activity is induced when lactose is present in the medium, whereas in case of trp operon, repression of the gene activity takes place in presence of tryptophan in the medium.
2. lac operon spans about 4-6kb...whereas trp operon spans abut 7kb.
3. lac operon helps in the breakdown of lactose into glucose and galactose, to generate energy( catabolic pathway ) in case of trp operon, it helps in the synthesis of enzymes required for the formation of the amino acid Tryptophan( anabolic pathway ).
4. lac operon is an example of positive regulation ; and trp operon is an example of negative regulation.
Trp operon is also regulated by other mechanism called attenuation while no such even occurs in lac operon . .
What else can I help you with?
Is the lac operon the only example of genes regulated by repressor proteins?
No, the lac operon is not the only example of genes regulated by repressor proteins. There are many other gene regulatory systems where repressor proteins play a role in controlling gene expression. Examples include the trp operon, the ara operon, and the gal operon in bacteria.
What genes is not a part of the lac operon?
repressor gene
What is a clue that the lac operon is on?
One clue that the lac operon is on is the presence of lactose in the environment. The lac operon is induced when lactose is available as a substrate for the lac repressor protein, allowing transcription of genes involved in lactose metabolism.
What turns the lac operon on and off?
The lac operon is turned on when lactose is present in the environment and glucose is scarce. This leads to the activation of the lac repressor protein, allowing the expression of genes involved in lactose metabolism. The lac operon is turned off when lactose is absent or glucose is abundant, which prevents the unnecessary expression of these genes.
The lac operon is shut off when what is absent?
The lac operon is shut off when lactose is absent. In the absence of lactose, the repressor protein binds to the operator site, preventing transcription of the lac operon genes.
What are the roles of allolactose in the lac operon and tryptophan in trp operon?
allolactose acts as an inducer
Is the lac operon the only example of genes regulated by repressor proteins?
No, the lac operon is not the only example of genes regulated by repressor proteins. There are many other gene regulatory systems where repressor proteins play a role in controlling gene expression. Examples include the trp operon, the ara operon, and the gal operon in bacteria.
The operon that controls the metabolism of lactose is called the what?
its an operon required for the transport and metabolism of lactose.
What genes is not a part of the lac operon?
repressor gene
In E. coli the tryprophan switches off the trp operon by?
binding to the trp repressor, causing a conformational change that allows it to bind to the operator region of the trp operon. This blocks RNA polymerase from transcribing the genes, turning off expression of the trp operon.
What is a clue that the lac operon is on?
One clue that the lac operon is on is the presence of lactose in the environment. The lac operon is induced when lactose is available as a substrate for the lac repressor protein, allowing transcription of genes involved in lactose metabolism.
Why lac operon the gene expression is switch off?
explain the regulation of gene expression in lac operon.
When is lac operon most active?
The lac operon is most active when glucose levels are low and lactose is present.
What does tryptophan bind to when it is present in e. coli?
trp operon
What turns the lac operon on and off?
The lac operon is turned on when lactose is present in the environment and glucose is scarce. This leads to the activation of the lac repressor protein, allowing the expression of genes involved in lactose metabolism. The lac operon is turned off when lactose is absent or glucose is abundant, which prevents the unnecessary expression of these genes.
The lac operon is shut off when what is absent?
The lac operon is shut off when lactose is absent. In the absence of lactose, the repressor protein binds to the operator site, preventing transcription of the lac operon genes.
Is the lac operon found in prokaryotes or eukaryotes?
The lac operon is found in prokaryotes, specifically in bacteria such as Escherichia coli. It is a regulatory system that controls the expression of genes involved in lactose metabolism. Eukaryotic cells do not typically have operons like the lac operon.
