Need help with explanation Thank you What is the function of the promoter in the
ID: 967672 • Letter: N
Question
Need help with explanation Thank you What is the function of the promoter in the E. coli lac operon? A promoter is a type of DNA sequence that activates or inactivates the expression of the lac operon genes by acting as a protein binding site A promoter is a type of DNA sequence that is located outside the lac operon and expresses the protein that inactivates lactose gene expression. A promoter is a type of DNA sequence that activates the expression of the lactose genes by acting as an RNA polymerase binding site for the lac operon. A promoter is a type of protein that inactivates the expression of the lac operon genes by binding to the DNA of the lac operon.Explanation / Answer
The correct answer is:
A promoter is a type of DNA sequence that activates the expression of the lactose genes by acting as an RNA polymerase binding site for the lac operon.
In the mechanism of lactose metabolism there are several structures that take part so that the process is carried out properly. The promoter in particular plays an important role because it provides a site to which the RNA polymerase binds so that the transcription process is initiated.
These are the characteristics of the promoter:
- It is the sequence that causes the initiation of transcription.
- In the specific case of E. Coli we have two promoters, a few nucleotides before the start, so that if the start is marked with 1, we find: A promoter in -10, which is the TATA and another promoter in -35, which is the GACA.
- Before starting the transcripicón, RNA polymerase must have undergone some changes in its estructure, because it is a multi-enzyme complex, thus requiring to be complete.
- The particle that joins the polymer core particle is particle ?. Without ? you can normally perform transcription, but can not recognize the promoter.