Unit 6 · 6.3 — Transcription and RNA Processing [cite: 9, 28]

Everything to learn here

• Concept: Transcription occurs strictly in the nucleus (in eukaryotes) where RNA polymerase synthesizes a complementary mRNA transcript from a DNA template strand [cite: 28].
• Concept: Eukaryotic pre-mRNA undergoes heavy modifications, including the crucial addition of a 5' GTP cap and a 3' Poly-A tail to protect and stabilize the transcript before nuclear export [cite: 14, 28].
• Vocabulary: Introns — intervening, non-coding segments of the mRNA transcript that are enzymatically excised during RNA processing [cite: 14].
• Vocabulary: Exons — the actual coding segments of the mRNA that are spliced together and subsequently translated into protein [cite: 14].
• Concept: Genetic information flows from DNA to RNA through transcription and then to proteins via translation.

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