archaeobacteria

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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
  1. considered ancient life forms that evolved separately from bacteria and blue-green algae

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