Phylogenic Status of Archaebacteria: Considerations Based on mRNA
Based on the sequence homology of ribosomal 16SRNA, Fox et al. (1977) have proposed a new taxonomic kingdom called “archaebacteria.” They proposed that organisms can be divided into three major groups, eubacteria (cyanobacteria and bacteria except archaebacteris), archaebacteria, and eukaryotes. They speculate that archaebacteria may have been the dominant form of life in early Archaen times (Woese and Fox, 1977). At the present, four types of unusual microorganisms are classified as archaebacteria: methane producing anaerobic bacteria, extreme halophiles, extreme acid-thermophiles, and extremely thermophilic anaerobes (Woese et al., 1978; Zillig et al., 1981).
KeywordsDirect Descendant Eukaryotic mRNA Extreme Halophile Halobacterium Halobium Sulfolobus Acidocaldarius
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