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RNA polymerase (purple) is a complex enzyme at the heart of transcription. During this process, the enzyme unwinds the DNA double helix and uses one strand (darker orange) as a template to create the single-stranded messenger RNA (green), later used by ribosomes for protein synthesis. From the RNA polymerase II elongation complex of Saccharomyces cerevisiae (PDB Structure 1i6h) as seen in PDB-101's What is a Protein? series.
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