0
Why is the tryptophan operon turned off in the presence of tryptophan?
Wiki User
∙ 11y ago
Tryptophan binds to and activates the repressor proteins; the repressor proteins, in turn, bind to the operator, preventing transcription.
Wiki User
∙ 11y ago
Add your answer:
Earn +20 pts
The tryptophan operon is a repressible operon that is?
Turned off whenever tryptophan is added to the growth medium
The tryptophan synthetase operon uses glucose to synthesize tryptophan Repressible operons such as this one are?
turned off whenever tryptophan is added to the growth medium.
What turns the lac operon on and off?
The lac operon is turned off and on by repressors.
A lac repressor turns off the lac genes by binding to?
When the lac repressor binds to the O region, RNA polymerase is prevented from beginning the process of transcription. In effect, the binding of the repressor protein turns the operon "off" by preventing the transcription of its genes. (Prentice Hall Biology Book .....Chapter 12 page 310)
What is a clue that the lac operon is on?
The lac operon uses a two-part control mechanism to ensure that the cell expends energy producing the enzymes encoded by the lac operon only when necessary. In the presence of lactose, the lac repressor halts production of the enzymes encoded by the lac operon.
The tryptophan operon is a repressible operon that is?
Turned off whenever tryptophan is added to the growth medium
The tryptophan synthetase operon uses glucose to synthesize tryptophan Repressible operons such as this one are?
turned off whenever tryptophan is added to the growth medium.
What turns the lac operon on and off?
The lac operon is turned off and on by repressors.
A lac repressor turns off the lac genes by binding to?
When the lac repressor binds to the O region, RNA polymerase is prevented from beginning the process of transcription. In effect, the binding of the repressor protein turns the operon "off" by preventing the transcription of its genes. (Prentice Hall Biology Book .....Chapter 12 page 310)
What acts as an on and off switch in an operon?
which part of an operon acts as the on or off switch?
What is a clue that the lac operon is on?
The lac operon uses a two-part control mechanism to ensure that the cell expends energy producing the enzymes encoded by the lac operon only when necessary. In the presence of lactose, the lac repressor halts production of the enzymes encoded by the lac operon.
Difference between inducible and repressible operons?
The differences between these two types of operons are significant. In the repressible operon, The product is the regulatory metabolite and starts in the "on" position allowing RNA primase to unzip mRNA. Also the repressor protein only bings to the operator gene in the presence of the regulatory metablite. In the inducible operon, The reactact is the regulartory metabolite and starts in the off position blockig the primase from unzipping mRNA. The repressor protein only binds to the operator gene in the absence of the regulatory metabolite.
What turns the lac operon off and off?
Repressors
Why lac operon the gene expression is switch off?
explain the regulation of gene expression in lac operon.
The lac operon is shut off when what is absent?
Lactose is absent
The lac operon enables a bacterium to build the proteins needed for lactose metabolism only when?
Lactose is present, otherwise the lac operon is not needed and is shut off.
What is a repressible operon?
is one that is usually on; binding of a repressor to the operator shuts off transcription
