Bacteria occupy their own domain of life. The domain Eubacteria is tremendously diverse and embraces no fewer than 30 distinct phyla, according to the LSPN classification schema. Because of the eagerness with which bacteria exchange genes across species barriers via lateral gene transfers, firm classifications according to lineage are difficult to establish with certainty.Continue Reading
Taxonomists divide life into major suborders, chiefly domain, kingdom, phylum and class. Bacteria belong to the domain Eubacteria, which is one of the three domains of life on Earth. According to Wikipedia, the old designation for bacteria, Prokaryota, can be used only to distinguish bacteria and archaeans from the plants, animals and fungi of Eukaryota and is therefore of limited value. Within Eubacteria, organisms are grouped into phyla and classes, though these levels of classification were developed for eukaryotes and cannot take into account the frequency with which bacteria trade genetic material.
Traditional lines of phylogeny begin to break down at levels below class, as bacterial "species" rarely exist in genetic isolation, notes Wikipedia. Lower-level classification thus becomes largely a matter of opinion, as the majority-similarity rule for identifying a bacterial species, if applied to mammals, would group humans, apes and monkeys together as a single "species."Learn more about Biology
It is believed that the first organisms to appear on Earth resembled singled-celled life forms known as Archaea, which are similar to bacteria but lack nuclei. Modern-day Archaea can live in extreme environments such as hot springs and deep-sea vents. These conditions replicate some of those on early Earth.Full Answer >
The three domains of life are bacteria, eukaryota and archaea. Each of these domains classifies a wide variety of life forms. For example, animals, plants, fungi and more all fall under eukaryota.Full Answer >
The five kingdoms classification system of life consists of the Monera, which includes the bacteria and archaebacteria; Protista, which includes protozoa, slime molds and algae; Fungi; Plantae; and Animalia. The five kingdom classification system is outdated, as the bacteria and archaebacteria are now recognized as being different enough to be in separate kingdoms. These two groups do share the lack of a nucleus, an organelle which all other kingdoms possess.Full Answer >
Bacteria are prokaryotic cells, which are characterized by a lack of a membrane-bound nucleus. They are typically simpler than eukaryotic cells, which have a membrane-bound nucleus and organelles responsible for cell function.Full Answer >