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Questions tagged [operons]

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How is the breakdown of lactose regulated at the gene level?

How is the breakdown of lactose regulated at the gene level? This is my answer: Without lactose in the cell, the repressor protein binds to the operator and prevents the read through of RNA ...
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Problem in understanding Operon

Is there a good book that explains operons: lac operon and trp operon in details. I was reading the functioning of the trp repressor protein from 'Principles of genetics-by Snustard and Simmons',...
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Are the subordinate genes of a repressed operon really “turned off”?

Operons are often described using all or nothing language. A repressor binding to the operator is usually presented as "turning off" the regulated genes. Case in point, Scitable at Nature.com says: ...
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Lac operon: How can lactose enter the cell in the absence of lactose permease?

My textbook states that lactose permease...transports lactose into the cell and When lactose is added to the growth medium, the lactose molecules bind to the other site on the repressor protein ...
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What is an operon?

What is an operon in a eukaryotic cell, and how does it regulate the expression of genes? I've already read Wikipedia, but it is not enough clear to me. Unfortunately my knowledge in genetics are very ...
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Constitutive mutation in operator gene

If a constitutive mutation happens in the operator of an inducible operon, does that mean that repressors won't be able to bind them ? Or does it mean that even if repressors are bound, they will not ...
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How can a continuous RNA be transcribed in the lac operon?

The lac operon has 3 genes: lacZ , lacY and lacA. I have seen that the m-RNA transcript of these genes has stop codons in between. So, how can the RNA be made continuously? Won't the RNA Pol detach if ...