Related Experiment Video

Updated: Jan 19, 2026

Three-Domain System of Life
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Three-Domain System of Life

Published on: June 12, 2025

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The Consideration of Future Consequences: Evidence for Domain Specificity Across Five Life Domains

Lisa Murphy1, Eimer Cadogan1, Samantha Dockray1

  • 1University College Cork, Ireland.

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Three-Domain System of Life01:21

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Ribosomal RNA (rRNA) sequence analysis revealed three distinct groups of cells: eukaryotes, bacteria, and archaea. In 1978, Carl R. Woese proposed the concept of domains, a taxonomic level above kingdoms, to differentiate these groups. He suggested that archaea and bacteria, despite their similar appearance, represent separate domains. Domains differ in rRNA, membrane lipid structure, transfer RNA, and antibiotic sensitivity.In this classification, animals, plants, and fungi belong to the...
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