archaeobacteria
Definition
Noun 1. A group of single-celled microorganisms: Archaeobacteria are considered ancient life forms that evolved separately from true bacteria (eubacteria) and blue-green algae (cyanobacteria). They are often found in extreme environments and have distinct genetic and biochemical characteristics.
Usage Examples
- Scientists study archaeobacteria to understand the early evolution of life on Earth.
- Some archaeobacteria, called methanogens, produce methane gas.
- The discovery of archaeobacteria living in hot springs changed our view of the tree of life.
Advanced Usage
- Domain Archaea: In modern biological classification, "archaeobacteria" are now more commonly referred to simply as Archaea, which is one of the three domains of life, alongside Bacteria and Eukarya.
- The domain Archaea includes many organisms once called archaeobacteria.
Variants and Related Words
- Archaeon (noun, singular): A single organism belonging to the archaeobacteria/Archaea.
- This particular archaeon thrives in highly saline water.
- Archaeal (adjective): Relating to or characteristic of archaeobacteria.
- The study focused on the archaeal cell membrane structure.
Synonyms
- Archaea (noun): The modern taxonomic term.
- Archaebacteria (noun): An alternative, older spelling.
Notes on Meaning
- The term "archaeobacteria" (or "archaebacteria") literally means "ancient bacteria," but this is now considered a misnomer. They are not bacteria but a separate, evolutionarily distinct domain. The word is primarily used in historical or educational contexts explaining the development of biological classification. The preferred contemporary term is Archaea.
Noun
-
considered ancient life forms that evolved separately from bacteria and blue-green algae
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