Transcription is the vital biological process where a cell copies a specific segment of DNA into an RNA molecule. It serves as the initial phase of gene expression. This mechanism enables the cell to rewrite permanent genetic instructions into a portable transcript. Typically, this transcript takes the form of messenger RNA (mRNA), which bridges the gap between the protected DNA inside the nucleus and the protein-building ribosomes in the cytoplasm. The Three Key Stages
The entire process is tightly managed and moves through three consecutive steps:
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