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Compare RNA-dependent RNA polymerase. RNA polymerase (RNAP or RNApol), also known as DNA-dependent RNA polymerase, is an enzyme that produces primary transcript RNA. In cells, RNAP is necessary for constructing RNA chains using DNA genes as templates, a process called transcription.
During transcription the gene (double-stranded DNA) is copied or transcribed into an virtually identical single-stranded messenger RNA molecule (mRNA). In eukaryotes this process occurs in the nucleus. Transcription: 1) RNA polymerase transcribes DNA to make messenger RNA (mRNA).2) The mRNA sequence (dark red strand) is complementary to the DNA sequence (blue strand). Translation: 3) On ribosomes, transfer RNA (tRNA) helps convert mRNA into protein.n eukaryotes this process occurs in the nucleus. Transcription: 1) RNA polymerase transcribes DNA to make messenger RNA (mRNA). 2) The mRNA sequence (dark red strand) is complementary to the DNA sequence (blue strand).