A gene can have 100 -1000 promoters.
A promoter is the region of the DNA that initiates transcription of a particular gene.
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The lac operon is most active when glucose levels are low and lactose is present.
The lac operon is turned off and on by repressors.
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 . .
Turned off whenever tryptophan is added to the growth medium
The transcription initiation complex around the TATA box.
Operon. It contains the promoter, operator, and the structural gene.
The main function of a promoter is to bring attention of an event to the public. Boxing promoters, for example, are adept at hyping fights to heighten interest.
minimum of two promoters should be there in a company
The melibiose operon is a group of genes found in Gram Negative Enterobacteria that regulate melibiose degradation as a carbon source. It consists of three genes, which are all under regulation by two promoters. One promoter is active at high glucose levels, which leads to the transcription of an inhibitor of the rest of the operon. The other promoter is active at low glucose levels that activates expression of the enzymes needed to break down melibiose. The three genes are melA, melB, and melR. melA encodes the enzyme (alpha-galactosidase) that degrades melibiose into glucose and galactose. melB encodes a permease (pump) that allows melibiose to enter the cell. melR encodes a transcriptional regulator, which is responsible for the regulation of the promoters described above.
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.
its an operon required for the transport and metabolism of lactose.
which part of an operon acts as the on or off switch?
The lac operon is most active when glucose levels are low and lactose is present.
What are the scientific word promoters?
The lac operon is turned off and on by repressors.
allolactose acts as an inducer
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 . .