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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 . .
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When does the induction of the lac operon occur?
The lac operon is most active when glucose levels are low and lactose is present.
What turns the lac operon on and off?
The lac operon is turned off and on by repressors.
What is a clue that the lac operon is on?
The lac operon uses a two-part control mechanism to ensure that the cell expends energy producing the enzymes encoded by the lac operon only when necessary. In the presence of lactose, the lac repressor halts production of the enzymes encoded by the lac operon.
What does the promoter of the lac operon sac do?
The promoter region of the lac operon is where the RNA polymerase begins to bind for the transcription of the structural gene Y and Z
The lac operon enables a bacterium to build the proteins needed for lactose metabolism only when?
Lactose is present, otherwise the lac operon is not needed and is shut off.
What are the roles of allolactose in the lac operon and tryptophan in trp operon?
allolactose acts as an inducer
When does the induction of the lac operon occur?
The lac operon is most active when glucose levels are low and lactose is present.
What turns the lac operon on and off?
The lac operon is turned off and on by repressors.
The operon that controls the metabolism of lactose is called the what?
its an operon required for the transport and metabolism of lactose.
Why lac operon the gene expression is switch off?
explain the regulation of gene expression in lac operon.
What is a clue that the lac operon is on?
The lac operon uses a two-part control mechanism to ensure that the cell expends energy producing the enzymes encoded by the lac operon only when necessary. In the presence of lactose, the lac repressor halts production of the enzymes encoded by the 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
Is the lac operon found in prokaryotes or eukaryotes?
The lac operon is found in enteric bacteria, predominantly Escherichia coli, therefor it is found in prokaryotes.
How many genes in the lac operon are found in e. coli?
My answer is 3, I am pretty sure I am right, but I would double check to make sure. I am in ninth grade taking biology at PineTree.
What does the promoter of the lac operon sac do?
The promoter region of the lac operon is where the RNA polymerase begins to bind for the transcription of the structural gene Y and Z
The lac operon enables a bacterium to build the proteins needed for lactose metabolism only when?
Lactose is present, otherwise the lac operon is not needed and is shut off.
