75 bases upstream of a eukaryotic promoter. 35 bases upstream of a prokaryotic promoter. A fragment of DNA containing an RNA polymerase II promoter was heavily mutated in the -25 region, and then added to an in vivo transcription system. The most likely observation would be that a. transcription was completely eliminated. I promoters a. flank the rRNA precursor gene on the 3'-side.
Eukaryotes control gene expression at the level of a. transcription.
All of the above are true. Several R-loops formed. This indicates that a. the gene contains one intron. Exons represent sequences of DNA that are a. never transcribed. An intron is a. a region of mRNA that is not translated.