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## Microorganisms **Figure 2.1. Universal phylogenetic tree life constructed from small subunit of rRNA (SSU rRNA) gene sequence analysis, after Karl Woese. Image credit: Modified from Eric Gaba, Wikimedia Commons.** In general, there are five main groups of microorganisms, although each group can...

## Microorganisms **Figure 2.1. Universal phylogenetic tree life constructed from small subunit of rRNA (SSU rRNA) gene sequence analysis, after Karl Woese. Image credit: Modified from Eric Gaba, Wikimedia Commons.** In general, there are five main groups of microorganisms, although each group can be subdivided (Figure 2.2). These groups are: * Bacteria * Fungi * Viruses * Protozoa * Some algae ## Biology Grade 12 **Unit 2: Microorganisms** **The Last Universal Common Ancestor (LUCA)** **Bacteria** * Spirochetes * Proteobacteria * Cyanobacteria * Planctomyces * Bacteroides * Cytophaga * Thermotoga * Aquifex **Gram-positives** **Archaea** * Chloroflexi * Methanosarcina * Methanobacterium * Methanococcus * Thermococcus celer * Thermoproteus * Pyrodictidum * Entamoebae * Haloarchaea **Eukaryota** * Slime molds * Animals * Fungi * Plants * Ciliates * Flagellates * Trichomonads * Microsporidia * Diplomonads