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∙ 13y ago
When a repressor is bound to the operator, it physically blocks the RNA polymerase from binding to the promoter region of the gene, preventing transcription. This mechanism effectively shuts down gene expression by inhibiting the initiation of transcription of that specific gene.
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What turns off transcription by binding to the operator?
A repressor protein turns off transcription by binding to the operator region. By binding to the operator, the repressor prevents the RNA polymerase from binding to the promoter region and initiating transcription. This prevents the expression of the gene or genes downstream of the operator.
What state is the repressor protein in when tryptophan is absent?
When tryptophan is absent, the repressor protein is in an inactive state, allowing transcription of the trp operon to continue. This is because the repressor protein needs tryptophan to bind to it, enabling it to attach to the operator region and block transcription of the operon.
The expression of the tryptophan operon is controlled by?
The expression of the tryptophan operon is controlled by a repressor protein that binds to the operator region in the presence of tryptophan. When tryptophan levels are high, the repressor is active and prevents transcription of the operon. When tryptophan levels are low, the repressor is inactive, allowing transcription to occur.
The lac repressor releases the operator in the presence of glucose?
That statement is inaccurate. The lac repressor releases the operator in the absence of glucose but in the presence of lactose. Glucose acts as a catabolite activator protein (CAP) regulator in the lac operon system.
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.
Synthesis of a repressible enzyme is inhibited by?
The presence of excess amounts of the final product of the enzyme pathway. This feedback mechanism helps regulate the overall production of the enzyme in response to the cell's current needs, preventing unnecessary synthesis when the product is already abundant.
What is Corepressor and their function?
The metabolite that when bound to the repressor (of a repressible operon) forms a functional unit that can bind to its operator and block transcription.
The operon segment composed of the gene that codes for a protein repressor is called the?
The operon segment composed of the gene that codes for a protein repressor is called the regulatory gene. This gene produces the repressor protein that can bind to the operator region of the operon, preventing transcription of the structural genes when the repressor is bound.
When this is taken up by the cell it binds to the repressor so that the repressor no longer binds to the operator?
The inducer.
A protein that binds to an operator and inhibits transcription?
A repressor protein binds to the operator region of DNA to inhibit the binding of RNA polymerase, blocking transcription of the gene. This mechanism is common in prokaryotic organisms to regulate gene expression by preventing transcription of specific genes when they are not needed.
Which region of the operon does the repressor bind to?
It binds to the operator.
A lac repressor turns ff the lac genes by binding to?
the operator DNA sequence, blocking RNA polymerase from transcribing the lac genes. This prevents the production of proteins involved in lactose metabolism.
What turns off transcription by binding to the operator?
A repressor protein turns off transcription by binding to the operator region. By binding to the operator, the repressor prevents the RNA polymerase from binding to the promoter region and initiating transcription. This prevents the expression of the gene or genes downstream of the operator.
In prokaryotes a protein that binds to the operator and blocks the prometer is called?
Repressor
When the lac repressor protein binds to the?
The other region is the OPERATOR (O) e coli cells contains several copies of a DNA binding proteins known as the lac repressor, which can be bind to the O region your answer: Operator
Why is the tryptophan operon turned off in the presence of tryptophan?
The tryptophan operon is turned off in the presence of tryptophan because tryptophan acts as a corepressor. When tryptophan levels are high, it binds to the trp repressor protein. This trp-repressor complex then binds to the operator region of the operon, preventing RNA polymerase from transcribing the genes involved in tryptophan synthesis.
Synthesis of an inducible enzyme requires?
Substrate bound to a repressor Chris G.
