Is this a true statement??? (In regards to gene regulation)

[Lazerous]

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The repressor-corepressor binds to the operator and represses enzyme synthesis?

Isn't this tru and an example of it would be the tryptophan Operon in E. Coli?

 

[Thundercatz]

The repressor-corepressor binds to the operator and represses enzyme synthesis?

Isn't this tru and an example of it would be the tryptophan Operon in E. Coli?

The first part is true, but I believe the Lac Operon is regulated by the inducible system.

 

[Lazerous]

The first part is true, but I believe the Lac Operon is regulated by the inducible system.

Yeah the second part isn't important. Now back to the first part; that is from question 34 in Top Score Test 1 and that wasn't the answer.

They had the answer as: The repressor binds to the operator, forming a barrier that prevents genes from being transcribed.
And I can see why this statement is correct but I don't see why the other one is incorrect: The repressor-corepressor binds to the operator and represses enzyme synthesis

 

[xhamburgersamx]

The first part is true, but I believe the Lac Operon is regulated by the inducible system.

Yes, the lac operon is an inducible system. As to the OP, in an repressible system - the repressor is inactive unless it binds with a co-repressor. When this happens, it blocs the operator on the gene and prevents transcription of whatever gene that specific mRNA codes for

 

[Lazerous]

Yes, the lac operon is an inducible system. As to the OP, in an repressible system - the repressor is inactive unless it binds with a co-repressor. When this happens, it blocs the operator on the gene and prevents transcription of whatever gene that specific mRNA codes for

Exactly! So this statement still hold true then: "The repressor-corepressor binds to the operator and represses enzyme synthesis" and that means there are two possible answers, no?

 

[doc3232]

Exactly! So this statement still hold true then: "The repressor-corepressor binds to the operator and represses enzyme synthesis" and that means there are two possible answers, no?

Ya, I see what you are saying OP.
Maybe they mean that it isn't synthesizing enzymes directly and is just making mRNA...

 

[Lazerous]

Ya, I see what you are saying OP.
Maybe they mean that it isn't synthesizing enzymes directly and is just making mRNA...

Ya, the only explanation I could come up with for this answer: "The repressor-corepressor binds to the operator and represses enzyme synthesis" is that the repressor-corepressor doesn't actually repress enzyme synthesis but rather it represses mRNA synthesis which later on codes for enzymes.