<P> Transcription is the first step of gene expression, in which a particular segment of DNA is copied into RNA (especially mRNA) by the enzyme RNA polymerase . Both DNA and RNA are nucleic acids, which use base pairs of nucleotides as a complementary language . During transcription, a DNA sequence is read by an RNA polymerase, which produces a complementary, antiparallel RNA strand called a primary transcript . </P> <P> Transcription proceeds in the following general steps: </P>

What is the role of rna polymerase during transcription
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