BIO206H5 Chapter Notes - Chapter 4: Dna Polymerase, Eukaryotic Transcription, Tata Box
Document Summary
Portions of dna sequence are transcribed into rna" (cid:1) first step a cell takes in reading out one of its many thousands of genes is to copy the nucleotide sequence of that gene into rna ( transcription") * refer to fig 7-3 on pg 233 for rna composition & structure * Rna, allowing the two strands of dna behind the polymerase to rewind. In bacteria, a set of adjacent genes is often transcribed as a single mrna that therefore carries the info for several different proteins. Signals in dna tell rna polymerase where to start & finish". Rna chain (cid:1) sigma ( ) factor": a subunit of the bacterial polymerase that is primarily responsible for recognizing the promoter sequence on dna, once the polymerase has latched onto the dna at this site, has synthesized approx. Table 7-2 the three rna polymerases in eukaryotes. Protein-coding genes, mirna genes, plus genes for some small rnas (e. g. those in spliceosomes) trna genes.
