Bacteria and Friends

People have a new nemesis and it is the phobia that is sweeping across the World: Germs. These “germs” or bacteria is what keeps little Johnny is his plastic bubble prior to his daily visit to the jungle gym. This sudden battle against bacteria has implanted the idea in every American that bacteria and Humans cannot coexist. However, bacteria are a very important aspect to the biosphere. In fact all single cell organisms began with Prokaryotes, which split into two groups as evolution progressed through numerous generations, the Eubacteria and the Archaebacteria. Eubacteria are prokaryotic cells, meaning that they lack nuclei and the normal set of organelles found in a plant or animal cell. This bacterium consists of DNA within the cytoplasm, which also carries unbound ribosomes within the boundaries of the cell walls. The other group that emerged from the split of the Prokaryotes is the Archaebacteria. Archea, meaning “ancient ones,” consist of bacteria that are able to withstand extremely harsh environments. Recent gene sequencing studies have shown that Archaebacteria are more closely related to Eukaryotes. This information has led to a broader category called Domain: Eubacteria, Archaebacteria, and Eukarya.

Domain Archae (Archaebacteria)

Methanogens
Extreme Halophiles
Extreme Thermophiles

Domain Bacteria (Eubacteria)
Spirochetes
Chlamydias
Gram-Postive Bacteria
Cyranobacteria
Proteobacteria

Evolution

Study Guide