Why are protists and bacteria grouped into different domains? Biology Introduction to Biology Classification and Domains of Life 1 Answer Rawda Eada Dec 8, 2015 Protists are eukaryotic cells while bacteria are prokaryotic. Answer link Related questions Explain the three domains of life. How are the three domains of life related to each other? How can a classification scheme aid a scientist? How does classification differ from phylogeny? How does one remember classification of organisms? What classification is a worm? Why is classification important in biology? How does domain eukarya differ from domain bacteria and domain archaea? What are some examples of domain archaea? How do domain archaea and domain bacteria differ? See all questions in Classification and Domains of Life Impact of this question 5718 views around the world You can reuse this answer Creative Commons License