BIO 1140 Midterm: Revision 7
4 Apr 2016
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Understand, describe, and demonstrate the steps involved in transcribing dna to mrna. Be familiar with the elements comprise in a transcripion iniiaion complex and its role. Compare and contrast rna transcripion in prokaryotes vs eukaryotes. Q: before transcribing a gene to mrna, dna must irst be replicate. A: false, transcripion can happen by itself, without replicaion of gene 1:09:00 signal transducion 3. The rna strand produced is elongated in the 5" to 3" direcion. The rna polymerase ii reads the 3"-5" dna strand (the template strand) In prokaryotes, dna is directly transcribted to mrna. In eukaryotes, dna is transcribed to a pre-messenger. Rna, that will be matured into mrna (through rna processing), and then be transported out of nucleus. Prokaryotes (bacteria only have 1 rna polymerase that does all the work) 1: requires the sigma factor ( ) to bind to the promotor region for iniiaing transcripion, accompanied by the unwinding of the dna in.
