Question

what is the function of rna polymerase in the process of transcription?
it \proofreads\ dna prior to the start of transcription.
it adds base pairs to the new mrna transcript.
it sets the start and stop codons for transcription.

Explanation:

RNA polymerase is an enzyme that plays a crucial role in transcription. Transcription is the process of copying a segment of DNA into mRNA. According to the description in the image, RNA polymerase attaches to the DNA and adds base pairs during elongation.

Answer:

It adds base pairs to the new mRNA transcript.