Mastering Transcription: The Vital First Step in Gene Expression

Which process produces messenger RNA?

Transcription

The process that produces messenger RNA (mRNA) is called transcription. It is the first step in gene expression and occurs in the nucleus of eukaryotic cells or the cytoplasm of prokaryotic cells. During this process, RNA polymerase binds to the promoter region of a gene on the DNA template strand, and then uses the complementary base pairs to add nucleotides to the growing mRNA molecule. Once the RNA polymerase reaches the termination sequence on the DNA, it stops adding nucleotides and releases the mRNA molecule. The mRNA then travels out of the nucleus into the cytoplasm where it can be translated into a protein by the ribosomes.

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