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whenever it's in that transcribing kind of mood
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∙ 11y ago
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What are features of the lactose operon?
---|CRP|-------------| O |---| Z | Y | A |---CRP: Binding site for activatorO: Operator, binding site for repressorCoding sequences:Z: b-galactosidaseY: lactose permeaseA: thiogalactoside transacetlyase
When does the induction of the lac operon occur?
The lac operon is most active when glucose levels are low and lactose is present.
In Figure 84 which model of the lac operon correctly shows RNA polymerase lactose and repressor protein when the structural genes are being transcribed?
regulatory promoter oerator
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.
The lac operon is shut off when what is absent?
Lactose is absent
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.
What would happen to the lac operon if a bacterium were growing in the presence of both glucose and lactose?
The regulatory portion of the operon is the only portion that would be transcribed.
What are features of the lactose operon?
---|CRP|-------------| O |---| Z | Y | A |---CRP: Binding site for activatorO: Operator, binding site for repressorCoding sequences:Z: b-galactosidaseY: lactose permeaseA: thiogalactoside transacetlyase
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.
When does the induction of the lac operon occur?
The lac operon is most active when glucose levels are low and lactose is present.
In Figure 84 which model of the lac operon correctly shows RNA polymerase lactose and repressor protein when the structural genes are being transcribed?
regulatory promoter oerator
The positive control of the lactose operon in bacteria is what?
Catabolite repression is the positive control of the lactose operon in bacteria. Glucose is metabolized initially and when depleted, the lactose.
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.
What happens when lactose is e coli's only food source?
The genes that produce the enzymes needed to break down lactose are not expressed.
When is lac operon most active?
The lac operon is most active when glucose levels are low and lactose is present.
