DNA Transcription

Problem : Why are there three types of RNA polymerases in eukaryotes and not in prokaryotes?

Problem : How do eukaryotic polymerases recognize promoter regions?

Problem : What is the name of the RNA polymerase II promoter element that is similar to the -10 region of prokaryotic polymerase promoters?

Problem : What is the name of the most important transcription factor for RNA polymerase II? What is its function?

Problem : What is the additional structural unit makes eukaryotic DNA less accessible to transcriptional machinery?