When does the cell have to use active transport? a. when the cell is low on energyb. when the cell is in a highly concentrated solutionc. to move molecules across the membrane quicklyd. to move molecules across the membrane against a gradient

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?