How can you tell whether a compound is organic

Prokaryotic and eukaryotic cells are different in many ways other than the presence or absence of a nucleus. if both archaebacteria and eubacteria are prokaryotic cells, then why are archaebacteria more closely related to eukaryotic cells than they are to eubacteria?

Which part of the microscope controls the amount of light which shines through the lens?

Where is transcription located? (assuming eukaryote cell)