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In prokaryotes a protein that binds to the operator and blocks the prometer is called?
Repressor
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.
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.
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.
Describe the effect a repressor has on the lac operon when lactose is present?
When lactose is present, it binds to the repressor protein, causing a conformational change that prevents the repressor from binding to the operator region of the lac operon. As a result, RNA polymerase can transcribe the structural genes of the lac operon, leading to the production of enzymes involved in lactose metabolism.
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.
The role of a metabolite that controls a repressible operon is to?
Function as a corepressor that binds to the repressor protein and activates it to bind to the operator region of the operon. This binding prevents RNA polymerase from transcribing the operon genes, leading to the downregulation of gene expression.
When lactose is present in bacterial does it prevent the blocking effect of the repressor protein and allow the transcription of lactose metabolizing genes?
Yes. A precursor to lactose binds to the repressor and prevents or relaxes its binding to the Lac operon.
What is an aporepressor?
An aporepressor is a repressor which binds with a corepressor.
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
Which region of the operon does the repressor bind to?
It binds to the operator.
What prevents e coli from expressing the lac genes in its DNA all of the time?
The lac genes in E. coli are regulated by the lac operon, which is controlled by a repressor protein. The repressor binds to the operator region of the DNA, blocking the transcription of the lac genes. When lactose is present, it binds to the repressor, causing a conformational change that releases the repressor from the operator, allowing for the expression of the lac genes.
