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a repressor that is active when it binds to tryptophan
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Why lac operon the gene expression is switch off?
explain the regulation of gene expression in lac operon.
How is the ath operon most likely controlled?
NEVER!!
Molecules that interact with DNA to alter gene expression are?
operon
Is operon proteins?
Operon is not a protein. It is a segment of DNA that has cluster of genes controlled by the elements such as promoter, operator. Lac operon is a classic example where it regulate the utilization of Lactose in the medium.
What is involved in regulating gene expression in prokaryotes but not in eukaryotes?
The regulation of gene expression allows prokaryotic cells, such as bacteria, to better respond to stimuli and to conserve energy and materials
The tryptophan operon is a repressible operon that is?
Turned off whenever tryptophan is added to the growth medium
What acts as a co-repressor to block transcription of the tryptophan operon?
Tryptophan
Why do both bacteria and humans need tryptophan?
Tryptophan induces the lac 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
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.
Why is the tryptophan operon turned off in the presence of tryptophan?
Tryptophan binds to and activates the repressor proteins; the repressor proteins, in turn, bind to the operator, preventing transcription.
Why lac operon the gene expression is switch off?
explain the regulation of gene expression in lac operon.
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 . .
How is the ath operon most likely controlled?
NEVER!!
Molecules that interact with DNA to alter gene expression are?
operon
Is operon proteins?
Operon is not a protein. It is a segment of DNA that has cluster of genes controlled by the elements such as promoter, operator. Lac operon is a classic example where it regulate the utilization of Lactose in the medium.
