Title: The Evolution of Prokaryotes: Archaebacteria and Eubacteria - Video & Lesson Transcript | Study.com
Headings: The Evolution of Prokaryotes: Archaebacteria and Eubacteria
The Evolution of Prokaryotes: Archaebacteria and Eubacteria
Lesson Transcript
Characteristics of Prokaryotes
Domain Archaea
Domain Bacteria
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The Evolution of Prokaryotes: Archaebacteria and Eubacteria
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Content: Lesson Summary
While both archaebacteria and eubacteria are prokaryotic, they are evolutionarily different. All prokaryotic cells are unicellular, have a cell wall and lack both a nucleus and membrane-bound organelles. Some use light energy to make food and are photoautotrophs, while others use chemicals to make food and are chemoautotrophs. The most ancient form of life on Earth belonged to the domain archaea, which contains the kingdom archaebacteria. These organisms live in extreme environments that most other life forms find uninhabitable. The three groups are thermophiles, halophiles and methanogenes. Archaebacteria have evolutionary similarities to both eubacteria and eukaryotic organisms, such as humans. The domain bacteria contains the kingdom eubacteria and is known as true bacteria. This domain contains the bacteria that are in our digestive systems, used to make food items, such as yogurt, and sometimes cause diseases. We can use antibiotics to kill bacteria and to treat diseases caused by these prokaryotes.