Transcription and mRNA Modification

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> polymerization adds phosphate that provides (atp) energy. > at the unwinding area we find a lot of tata. > by convention a gene location class one is where a transcription starts. > 1 is the first nucleotide copied into mrna. > upstream from where the first nucleotide is. > downstream is anything after the 1 which has positive numbers (this is where transcription occurs) > up and down are relative to the number 1. > the transcript is always given 5" to 3" direction. > heterogeneous nuclear rna (hnrna) is the unprocessed mrna. > the core promoter: defines the beginning of the coding regions. > rna polymerase i : transcribes 5. 8s, 18s, 28s rrnas. > rna polymerase iii: 5s mrna and trna. Ii for protein transcription fr is responsible om m. > rna polymerase ii promoter is present at the beginning of the gene. > tata box at (minus) -25 base pairs.

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