How DNA blueprints are copied into the language of life
In short: Transcription is the essential first step of protein synthesis. This video breaks down how cells navigate the complex architecture of DNA to create the mRNA instructions required for building proteins.
The process begins when the enzyme RNA polymerase unwinds the DNA double helix to expose the antisense template strand. Free RNA nucleotides then align via complementary base pairing to form a new strand. The enzyme facilitates the creation of phosphodiester bonds, constructing the mRNA backbone before the process terminates and releases the strand.
A key distinction in eukaryotic cells is post-transcriptional modification. The initial pre-mRNA contains both introns (non-coding regions) and exons (coding regions). To create mature mRNA, the cell must perform splicing to remove the introns, a step that differentiates eukaryotic transcription from that of prokaryotic cells.
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Sources
- Summary by Intellect · source: A-Level Biology - Transcription | Sense & Antisense Strands (2027/28 exams)
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