Research indicates that promoters may fall into one of two classes: focused or dispersed. How do these classes differ, and which genes tend to be associated with each?

Video transcript

Hi, everybody. Let's take a look at this practice problem together. Blank is a section of DNA that has multiple transcription start sites over 50 to 100 nucleotides and facilitates the transcription of a particular gene. So recall that a transcription start site um can be shorthanded with T S S and typically in eukaryotes, transcription start sites are located within promoters. Now, what is a promoter? Recall that it's a region of DNA that the RNA polymerase combined to. Therefore, the transcription start site is the location where transcription actually begins. So this means that we would expect our answer to be a promoter. So either A or C now be enhancer is not the correct answer. Recall that an enhancer is a regulatory gene element and it activates or enhances transcription de initiator is also not the correct answer because an initiator is a D N A section that marks the site of transcription. So we're left with either focus promoter or dispersed promoter. Now, a focus promoter is not the correct answer. Either a focus promoter is just that it is focused, meaning it has a single transcription start site. So the correct answers option C dispersed promoter and a dispersed promoter has multiple transcription start sites. Alright, everyone. I hope you found this helpful and I'll see you soon for the next practice problem.