Q. The place where RNA-polymerase attaches with the DNA is called :
(a) Promoter site
(b) Operator site
(c) Activator site
(d) Repressor site
Solution :
Correct option : A Transcription is when RNA is made from DNA. During transcription, RNA polymerase makes a copy of a gene from the DNA to mRNA as needed .During transcription, the DNA site at which RNA polymerase binds is called a promoter .Transcription begins with binding of sigma factor proteins to the RNA polymerase holoenzyme, allowing it to bind to promoter DNA.RNA polymerase creates a transcription bubble, which separates the two strands of the DNA helix. This is done by breaking the hydrogen bonds between complementary DNA nucleotides. Then RNA polymerase moves towards the transcription start site.
So, the correct answer is option A.
