In an inducible bacterial operon, what is the effect of the binding of the inducer molecule to the repressor protein? Inhibits the binding of the repressor protein to the operator and activates gene transcription Promotes the binding of the repressor protein to the operator and blocks gene transcription Has no effect on the binding of the repressor to the operator and transcription Inhibits the binding of DNA polymerase to the operator Promotes the splicing of the mRNA
Question
In an inducible bacterial operon, what is the effect of the binding of the inducer molecule to the repressor protein? Inhibits the binding of the repressor protein to the operator and activates gene transcription Promotes the binding of the repressor protein to the operator and blocks gene transcription Has no effect on the binding of the repressor to the operator and transcription Inhibits the binding of DNA polymerase to the operator Promotes the splicing of the mRNA
Solution
In an inducible bacterial operon, the binding of the inducer molecule to the repressor protein inhibits the binding of the repressor protein to the operator and activates gene transcription.
Here's the step by step process:
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In the absence of an inducer, the repressor protein binds to the operator region of the operon. This prevents RNA polymerase from transcribing the genes in the operon.
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When the inducer molecule is present, it binds to the repressor protein.
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This binding changes the shape of the repressor protein, preventing it from binding to the operator region.
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With the repressor protein no longer bound to the operator, RNA polymerase can now transcribe the genes in the operon. This leads to gene expression.
So, the binding of the inducer molecule to the repressor protein essentially turns on gene transcription in an inducible operon.
Similar Questions
In an inducible operon, the repressor protein in its native conformation binds to what? The co-repressor molecule The regulatory gene The operator region The IRES The DNA polymerase
Regulation of bacterial operons by inducers, e.g. lactose, exhibits which of the following properties?(1) Inducer binds to the repressor and __________(2) Inducer effect on RNA polymerase binding to the promoter: ___________(3) Repressor produced by:Select one:A.(1) Activates the repressor, (2) Enhances, (3) A separate geneB.(1) Inhibits the repressor, (2) No effect, (3) A separate geneC.(1) Inhibits the repressor, (2) Inhibits, (3) Genes of the operonD.(1) Activates the repressor, (2) Inhibits, (3) A separate geneE.(1) Activates the repressor, (2) Enhances, (3) Genes of the operon
In an operon, the repressor binds to the _______.ANSWERpromoteroperatorinducergenes
If E. coli bacteria are grown in the absence of lactoseMultiple Choicethe repressor will not bind the operator, thus allowing transcription of the lac operon genes.the repressor will bind the operator, thus allowing transcription of the lac operon genes.the repressor will not bind the operator, thus preventing transcription of the lac operon genes.the repressor will bind the operator, thus preventing transcription of the lac operon genes.No answer is correct.
/ Repressor proteins bind at the A. Operator B. Aktiveerder bindingspunte / Activator-binding sites C. Eerste strukturele geen van die operon / First structural gene of the operon D. Operon
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