Question

What is a major characteristic of open promoters?

1) They allow for the binding of RNA polymerase
2) They are only found in eukaryotic cells
3) They are always located upstream of the coding sequence
4) They are only active during transcription

Answer 1

Open promoters, or eukaryotic promoters, have several major characteristics such as allowing for the binding of RNA polymerase and being found in eukaryotic and prokaryotic cells.

Step-by-step explanation:

Open promoters, also known as eukaryotic promoters, have several major characteristics:

1. They allow for the binding of RNA polymerase, which is necessary for transcription to occur.
2. They are found in both eukaryotic and prokaryotic cells, but are more complex in eukaryotes.
3. They are not always located upstream of the coding sequence, as enhancers can be located upstream, within, or downstream of a gene.
4. They are not only active during transcription, as transcription factors must bind to the promoter region first and recruit RNA polymerase for transcription to be established.