Microbiology is the study of microscopic organisms includes unicellular (single cell), multicellular (cell colony) and acellular (lacking cells). Microbiology has many subdivisions and topics. They are virology , mycology and parasitology etc.
Membrane-bound cell organelles like fungi and protists are Eukaryotic microorganisms, whereas prokaryotic organisms like eubacteria and archaebacteria lacking membrane-bond organelles. Viruses is the very simple microorganisms and also considered as very complex molecules.
Microbiologists often rely on extraction or detection of nucleic acid, either DNA or RNA sequences.