plural noun (singular archaebacterium /-ˈti(ə)rēəm/)Biology
Microorganisms that are similar to bacteria in size and simplicity of structure but radically different in molecular organization. They are now believed to constitute an ancient intermediate group between the bacteria and eukaryotes. Also called archaea.
- What's more, these origin-of-life researchers suspect that the two major groups of bacteria, known as archaebacteria and eubacteria, originated on two separate occasions about 3.8 billion years ago.
- The most startling (and, for some people, unbelievable) such event was the origin of the eukaryotes by the fusion of an archaebacterium with some eubacteria.
- They conjecture that an evolutionary quantum leap happened after an archaebacterium swallowed a eubacterium.
- Example sentences
- The latter is highly conserved across many bacterial and archaebacterial species.
- They have also displayed antitumor activity and have been found to be the major lipid of archaebacterial membranes.
- These primitive microorganisms, members of the archaebacterial kingdom, may be very similar to the earliest life forms on Earth.
Modern Latin (plural), from Greek arkhaios 'primitive'.
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