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TRP is Television Rating Point. The popularity of TV programmes are measured by the TRPs they receive. This is done with a system called the Peoples Meter is used to measure the audience. Peoples Meter is an gadget fixed to the TV to help identify the programme watched by the viewers of the household.The ratings for programmes are calculated by tracking the viewers for each minute and then it is averaged by the total duration of the programme.
The Trp operon in bacteria controls the synthesis of tryptophan. It consists of regulatory genes that control the transcription of structural genes responsible for tryptophan biosynthesis. When tryptophan levels are low, the operon is activated, leading to increased production of tryptophan.
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How is lac operon different from trp operon?
1. in lac operon; gene activity is induced when lactose is present in the medium, whereas in case of trp operon, repression of the gene activity takes place in presence of tryptophan in the medium. 2. lac operon spans about 4-6kb...whereas trp operon spans abut 7kb. 3. lac operon helps in the breakdown of lactose into glucose and galactose, to generate energy( catabolic pathway ) in case of trp operon, it helps in the synthesis of enzymes required for the formation of the amino acid Tryptophan( anabolic pathway ). 4. lac operon is an example of positive regulation ; and trp operon is an example of negative regulation. Trp operon is also regulated by other mechanism called attenuation while no such even occurs in lac operon . .
Is the lac operon the only example of genes regulated by repressor proteins?
No, the lac operon is not the only example of genes regulated by repressor proteins. There are many other gene regulatory systems where repressor proteins play a role in controlling gene expression. Examples include the trp operon, the ara operon, and the gal operon in bacteria.
Why is the tryptophan operon turned off in the presence of tryptophan?
The tryptophan operon is turned off in the presence of tryptophan because tryptophan acts as a corepressor. When tryptophan levels are high, it binds to the trp repressor protein. This trp-repressor complex then binds to the operator region of the operon, preventing RNA polymerase from transcribing the genes involved in tryptophan synthesis.
If a particular operon encodes enzymes for making an essential amino acid and is regulated like the trp operon then will the amino acid act as a corepressor?
Yes, in the case of an operon encoding enzymes for making an essential amino acid and regulated like the trp operon, the amino acid would act as a corepressor. When the levels of the amino acid are sufficient, it can bind to the repressor protein, allowing it to bind to the operator region of the operon, thereby blocking transcription of the genes involved in amino acid biosynthesis.
What are the three components of an operon and there roles?
The three components of an operon are the promoter, operator, and structural genes. The promoter is where RNA polymerase binds to initiate transcription. The operator is a sequence where a repressor protein can bind to block transcription. The structural genes contain the information to encode proteins related to a specific biological function.
How is lac operon different from trp operon?
1. in lac operon; gene activity is induced when lactose is present in the medium, whereas in case of trp operon, repression of the gene activity takes place in presence of tryptophan in the medium. 2. lac operon spans about 4-6kb...whereas trp operon spans abut 7kb. 3. lac operon helps in the breakdown of lactose into glucose and galactose, to generate energy( catabolic pathway ) in case of trp operon, it helps in the synthesis of enzymes required for the formation of the amino acid Tryptophan( anabolic pathway ). 4. lac operon is an example of positive regulation ; and trp operon is an example of negative regulation. Trp operon is also regulated by other mechanism called attenuation while no such even occurs in lac operon . .
In E. coli the tryprophan switches off the trp operon by?
binding to the trp repressor, causing a conformational change that allows it to bind to the operator region of the trp operon. This blocks RNA polymerase from transcribing the genes, turning off expression of the trp operon.
What are the roles of allolactose in the lac operon and tryptophan in trp operon?
allolactose acts as an inducer
What does tryptophan bind to when it is present in e. coli?
trp operon
Is the lac operon the only example of genes regulated by repressor proteins?
No, the lac operon is not the only example of genes regulated by repressor proteins. There are many other gene regulatory systems where repressor proteins play a role in controlling gene expression. Examples include the trp operon, the ara operon, and the gal operon in bacteria.
Why is the tryptophan operon turned off in the presence of tryptophan?
The tryptophan operon is turned off in the presence of tryptophan because tryptophan acts as a corepressor. When tryptophan levels are high, it binds to the trp repressor protein. This trp-repressor complex then binds to the operator region of the operon, preventing RNA polymerase from transcribing the genes involved in tryptophan synthesis.
What is a repressible operon?
A repressible operon is a type of operon in bacteria where gene expression is usually active but can be turned off when a specific corepressor molecule binds to the repressor protein. This binding causes the repressor to bind to the operator region of the operon, blocking transcription and thus shutting down gene expression. An example of a repressible operon is the trp operon in E. coli, which is involved in tryptophan biosynthesis.
If a particular operon encodes enzymes for making an essential amino acid and is regulated like the trp operon then will the amino acid act as a corepressor?
Yes, in the case of an operon encoding enzymes for making an essential amino acid and regulated like the trp operon, the amino acid would act as a corepressor. When the levels of the amino acid are sufficient, it can bind to the repressor protein, allowing it to bind to the operator region of the operon, thereby blocking transcription of the genes involved in amino acid biosynthesis.
What state is the repressor protein in when tryptophan is absent?
When tryptophan is absent, the repressor protein is in an inactive state, allowing transcription of the trp operon to continue. This is because the repressor protein needs tryptophan to bind to it, enabling it to attach to the operator region and block transcription of the operon.
What are the three components of an operon and there roles?
The three components of an operon are the promoter, operator, and structural genes. The promoter is where RNA polymerase binds to initiate transcription. The operator is a sequence where a repressor protein can bind to block transcription. The structural genes contain the information to encode proteins related to a specific biological function.
The role of a metabolite that controls a repressible operon is to?
Function as a corepressor that binds to the repressor protein and activates it to bind to the operator region of the operon. This binding prevents RNA polymerase from transcribing the operon genes, leading to the downregulation of gene expression.
The term operon comes from the latin root word?
The term operon comes from the Latin word "operare," which means to work or function. In molecular biology, an operon refers to a functioning unit of genomic DNA containing a cluster of genes under the control of a single promoter.
