characteristics of the three domains
ARCHAEA
Organisms in the archaea domain are classified prokaryotes, have no cell nucleus or any other membrane-bound organelles, and don’t contain peptidoglycan in their cell walls. Archaea don't look that different from other bacteria but they are biochemically and genetically different than them. Unlike the Eubacteria and Eukarya, the Archaea have membrane lipids that are composed of branched hydrocarbon chains attached to glycerol by ether linkages. Having these linkages adds to their ability to survive in extreme conditions, since ether containing linkages are better able to withstand harsh conditions. They can survive in volcanic vents, at the bottom of the sea, sea vents, and hot springs. Archaea cells lack nuclei and other organelles which make them less complex organisms than the Eukarya. EXAMPLE: METHANOGENS & HALOPHILES
Organisms in the archaea domain are classified prokaryotes, have no cell nucleus or any other membrane-bound organelles, and don’t contain peptidoglycan in their cell walls. Archaea don't look that different from other bacteria but they are biochemically and genetically different than them. Unlike the Eubacteria and Eukarya, the Archaea have membrane lipids that are composed of branched hydrocarbon chains attached to glycerol by ether linkages. Having these linkages adds to their ability to survive in extreme conditions, since ether containing linkages are better able to withstand harsh conditions. They can survive in volcanic vents, at the bottom of the sea, sea vents, and hot springs. Archaea cells lack nuclei and other organelles which make them less complex organisms than the Eukarya. EXAMPLE: METHANOGENS & HALOPHILES
BACTERIA
Organisms in the bacteria domain are prokaryotic and like the Eukarya, have membranes composed of unbranched fatty acid chains attached to glycerol by ester linkages., RNA, no nuclear membrane. Unlike the Archaea and the Eukarya, the cell walls of Bacteria contain peptidoglycan. Bacterial cells lack nuclei and other organelles which make them less complex organisms than the Eukarya. Bacteria are responsible for many human diseases, but they are also responsible for maintaining the health, and important parts of all the ecosystems on Earth. EXAMPLE: STREP OR E.COLI
Organisms in the bacteria domain are prokaryotic and like the Eukarya, have membranes composed of unbranched fatty acid chains attached to glycerol by ester linkages., RNA, no nuclear membrane. Unlike the Archaea and the Eukarya, the cell walls of Bacteria contain peptidoglycan. Bacterial cells lack nuclei and other organelles which make them less complex organisms than the Eukarya. Bacteria are responsible for many human diseases, but they are also responsible for maintaining the health, and important parts of all the ecosystems on Earth. EXAMPLE: STREP OR E.COLI
EUKARYA
Organisms in the eukarya domain are eukaryotic, and like the Bacteria, they have membranes composed of unbranched fatty acid chains attached to glycerol by ester linkages. Not all Eukarya have cells with cell walls, but the ones that do the wall doesn’t contain peptidoglycan. The Eukarya are classified into the following kingdoms: Protista, Fungi, Plantae, and Animalia. EXAMPLE: Kingdoms Protista, Plantae, Fungi, Animalia
Organisms in the eukarya domain are eukaryotic, and like the Bacteria, they have membranes composed of unbranched fatty acid chains attached to glycerol by ester linkages. Not all Eukarya have cells with cell walls, but the ones that do the wall doesn’t contain peptidoglycan. The Eukarya are classified into the following kingdoms: Protista, Fungi, Plantae, and Animalia. EXAMPLE: Kingdoms Protista, Plantae, Fungi, Animalia