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When the lac operon controls the expression of proteins in the E.coli cell that can break down lactose into two sugars, glucose and galactose.
When lactose is present, it binds to the repressor that typically sits on the lac operon, changing the repressor's conformation such that it can no longer bind to the lac operon. Because of this, RNA polymerase can now transcribe the gene into mRNA, which in turn is translated into the proteins that can break down lactose.
What else can I help you with?
How many genes in the lac operon are found in e. coli?
My answer is 3, I am pretty sure I am right, but I would double check to make sure. I am in ninth grade taking biology at PineTree.
The lac operon helps E. coli absorb?
t68u56r3
Lactose in take in E. coli?
it is by lac operon syastem
How does e coli with limited food supply respond?
The lac operon is switched on so the E. coli can use it as a food source.
What is the lac operon in E. coli a classic example of?
gene expression occurring at transcription
What does the E coli the lac operon control?
When the lac operon controls the expression of proteins in the E.coli cell that can break down lactose into two sugars, glucose and galactose. When lactose is present, it binds to the repressor that typically sits on the lac operon, changing the repressor's conformation such that it can no longer bind to the lac operon. Because of this, RNA polymerase can now transcribe the gene into mRNA, which in turn is translated into the proteins that can break down lactose.
What happen to lac repressor in E. coli when lactose is present?
E. coli binds with lactose which changes its conformation so that it no longer binds to DNA. This allows the lactose operon to be transcribed.
Why does lac operon shut down some time after addition of lactose in the medium In the medium where E coli was growing lactose was added which induced the lac operon?
The lac operon in E. coli is initially activated in the presence of lactose, which is converted to allolactose, acting as an inducer that binds to the repressor protein and allows transcription of the genes needed for lactose metabolism. However, once lactose is consumed and its levels decrease, the concentration of allolactose drops, leading to the re-binding of the repressor to the operator region of the operon, thus shutting down transcription. Additionally, if glucose is present, it can inhibit lac operon expression through catabolite repression, further contributing to the shutdown.
What is the name of the DNA sequence that is located newr the promoter of the lactose operon and regulates the expression of the operon in E.Coli?
The DNA sequence located near the promoter of the lactose operon in E. coli that regulates its expression is called the lac operator. The lac operator binds the lac repressor protein, which inhibits transcription of the operon when lactose is absent. When lactose is present, it binds to the repressor, causing it to release from the operator and allowing transcription to proceed.
What molecule causes transcription of an operon?
The molecule that typically causes transcription of an operon is an inducer, which can either activate or repress the operon by binding to a regulatory protein. In the case of an inducible operon like the lac operon in E. coli, lactose acts as an inducer by binding to the repressor protein and preventing it from blocking transcription.
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.
What does tryptophan bind to when it is present in e. coli?
trp operon
