Is the sigma subunit bound to DNA polymerase delta (δ)?

Question

My notes say it's coupled to RNA polymerase alpha to start transcription, etc in prokaryotes, but on a take home test the question asks:

"A mutation in the sigma subunit of DNA polymerase δ causes it to remain tightly bound to the holoenzyme at all times." (Then we say what would happen in the scenario.)

Is the DNA pol. δ what part of the sigma subunit is part of? (Is it part of DNA pol, but "helps out" RNA pol.?) And I thought that DNA polymerase δ was specific to only prokaryotes (and DNA pol II was it's eukaryotic equivalent)....how is it in a bacterium/prokaryote then? I have a feeling she may have messed up what she told us in class, but unfortunately it's not in the book. I'm trying to figure out if it's a trick question or if that's how it was supposed to be.

Answer 1

I think it  is a misprint, and should be RNA polymerase. You might answer the question and make a note that you have assumed it is a typo. Better yet, contact your teacher for clarification of what she meant.

Answer 2

sigma subunit is bound to rna polymerase and not to dna polymerase. It guides the enzyme to the promoter sequence while transcription