Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

1. Promoter

Explanation:

Transcription is the process of RNA formation from DNA.

During transcription, RNA polymerase makes a copy of a gene from the DNA to mRNA.

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, thus, allowing it to bind to promoter DNA.

RNA polymerase creates a transcription bubble, which separates the two strands of the DNA helix.

Then RNA polymerase moves towards the transcription start site for the process of transcription.