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Catabolite repression is the positive control of the lactose operon in bacteria. Glucose is metabolized initially and when depleted, the lactose.
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What regarding control of the lac operon and lactose utilization in bacteria is false?
Bacteria preferentially utilize lactose as a carbon source.
The operon that controls the metabolism of lactose is called the what?
its an operon required for the transport and metabolism of lactose.
The obvious advantage of the lactose operon system is that?
lactose metabolizing enzymes need not be made when lactose is not present.
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.
What regarding control of the lac operon and lactose utilization in bacteria is false?
Bacteria preferentially utilize lactose as a carbon source.
The operon that controls the metabolism of lactose is called the what?
its an operon required for the transport and metabolism of lactose.
Why is the lac operon said to be an inducible operon?
Because it is normally inhibited and needs a precursor molecule to release the inhibitory molecule so that the bacteria can metabolize lactose. Induced.
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 does the E coli the lac operon control?
When the lac operon controls the expression of proteins in the E.coli cell that can break down lactose into two sugars, glucose and galactose. When lactose is present, it binds to the repressor that typically sits on the lac operon, changing the repressor's conformation such that it can no longer bind to the lac operon. Because of this, RNA polymerase can now transcribe the gene into mRNA, which in turn is translated into the proteins that can break down lactose.
What does the operon model attempt explain?
the coordinated control of gene expression in bacteria
The obvious advantage of the lactose operon system is that?
lactose metabolizing enzymes need not be made when lactose is not present.
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.
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 . .
What happen to lac repressor in E. coli when lactose is present?
E. coli binds with lactose which changes its conformation so that it no longer binds to DNA. This allows the lactose operon to be transcribed.
When is lac operon most active?
The lac operon is most active when glucose levels are low and lactose is present.
Lactose in take in E. coli?
it is by lac operon syastem
