Taxonomy in a Nutshell
The three-domain system is a biological classification that divides cellular life forms into archaea, bacteria, and eukaryote domains. It emphasizes the separation of prokaryotes into two groups, called Bacteria and Archaea. These two groups and eukaryotes each came from separate ancestors with poorly developed genetic make-ups. This classification system recognizes the fundamental divide between the two prokaryotic groups. Archaea appear to be more closely related to eukaryotes than they are to prokaryotic bacteria. The Archaea Domain consists of: being prokaryotic, having no nuclear membrane, RNA markers from eubacteria, possessing unique ancient evolutionary history for which they are considered some of the oldest species of organisms on Earth. The Bacteria Domain consists of: being prokaryotic, consisting of prokaryotic in their membranes and bacterial rRNA, and no nuclear membrane.
The Archaea Eukarya Domain consists of: being eukaryotic, and having a nuclear membrane.
In a five-kingdom system, living organisms are subdivided into five major kingdoms, including the Monera, the Protista, the Fungi, the Plantae, and the Animalia. Each kingdom is further subdivided into separate phyla. The Monera are unicellular and are usually found in colonies, including the eubacteria. Protista are unicellular protozoans, and unicellular and multi-cellular algae with cilia and flagella. Fungi are haploids and have two nucleus’s, are multi-cellular, generally heterotrophic, and don’t have cilia and eukaryotic flagella. Plantae have Haplo-diploid life cycles, are mostly autotrophic, and have a retaining embryo within female sex organ on parent plant. Animalia are multi-cellular animals, don’t have cell walls and don’t have photosynthetic pigments. In a six-kingdom system, it is exactly like the 5-kingdom system, but instead monera is divided into two different groups: bacteria and archaea. Bacteria are unicellular, prokaryotic, and live in extreme environments. Archaea are
The Archaea Eukarya Domain consists of: being eukaryotic, and having a nuclear membrane.
In a five-kingdom system, living organisms are subdivided into five major kingdoms, including the Monera, the Protista, the Fungi, the Plantae, and the Animalia. Each kingdom is further subdivided into separate phyla. The Monera are unicellular and are usually found in colonies, including the eubacteria. Protista are unicellular protozoans, and unicellular and multi-cellular algae with cilia and flagella. Fungi are haploids and have two nucleus’s, are multi-cellular, generally heterotrophic, and don’t have cilia and eukaryotic flagella. Plantae have Haplo-diploid life cycles, are mostly autotrophic, and have a retaining embryo within female sex organ on parent plant. Animalia are multi-cellular animals, don’t have cell walls and don’t have photosynthetic pigments. In a six-kingdom system, it is exactly like the 5-kingdom system, but instead monera is divided into two different groups: bacteria and archaea. Bacteria are unicellular, prokaryotic, and live in extreme environments. Archaea are