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The lac operon is found in enteric bacteria, predominantly Escherichia coli, therefor it is found in prokaryotes.
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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.
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.
How does lactose cause the lac operon to turn on?
The lac repressor protein has a binding site for lactose itself.
Where on the lac operon does transcription take place?
The lac operon encodes enzymes required in the digestion and transport of lactose. Transcription is activated when there is lactose in the cellular environment, and RNA polymerase binds to the promoter region of the operon, and activates the expression of lacA, lacZ and lacY.
Are operons found in eukaryotes?
"False. (I found the answer in my Biology textbook)" Not true. An operon is technically more than one gene sequence that is controlled by a repressor or signal. Recent research into eukaryotic genes, especially those in protists and chordates, have revealed that eukaryotes also have operons, though they are slightly different in complexity to the ones found in prokaryotes, giving rise to the conclusion that operons are more common than expected.
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.
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.
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 are the roles of allolactose in the lac operon and tryptophan in trp operon?
allolactose acts as an inducer
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
How is lac operon different from trp operon?
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 . .
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.
