Which step occurs first during transcription?
A)Free RNA nucleotides are added to an RNA chain.
B)RNA polymerase unwinds DNA.
C)RNA polymerase attaches to the promoter site.
D)The new RNA strand is released from RNA polymerase.
E)The introns are removed from the RNA strand.

Question

Quizplus · Accepted Answer

Transcription begins with RNA polymerase attaching to the promoter site on DNA. This step is necessary to initiate the process of synthesizing RNA from DNA. Only after the polymerase has attached to the promoter site can free RNA nucleotides be added, DNA be unwound, and the new RNA strand be released from the polymerase. The removal of introns occurs during RNA processing, which occurs after transcription.

Which Step Occurs First During Transcription