Microbiology For Dummies Cheat Sheet - dummies Microbiology For Dummies Cheat Sheet. When you’re studying microbiology, you need to know the key differences between the three domains of life, how scientists name and classify organisms, and how scientists identify microorganisms. There are three domains of life: Bacteria (also known as Eubacteria), Archaea, and Eukarya.[PDF] Microbiology Cheat - biochem4boards Microbiology Cheat Sheet Warning: Don’t go into the exam without knowing these facts! Some may have zero implication on your future as a dentist, but for whatever reason, these 20 tidbits tend to show up on the exam! Obligate anaerobic microorganisms in the oral cavity are normal ﬂora and opportunistic.