Three Domains of Life: Difference between revisions
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=='''<font size="5" color="#55075D"><br /> Three Domains of Life </font>'''== | =='''<font size="5" color="#55075D"><br /> Three Domains of Life </font>'''== | ||
Microbes are found in all three domains of life: bacteria, archaea, and eukaryotes.<br> | Microbes are found in all three domains of life: bacteria, archaea, and eukaryotes.<br> | ||
Diverse species of the three domains are explored in '''[[Microbial Biorealm]]'''. | Diverse species of the three domains are explored in '''[[Microbial Biorealm]]'''.<br> | ||
You can also explore the three domains through the [[Taxonomy Index]]. | |||
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Revision as of 19:51, 21 June 2006
Three Domains of Life
Microbes are found in all three domains of life: bacteria, archaea, and eukaryotes.
Diverse species of the three domains are explored in Microbial Biorealm.
You can also explore the three domains through the Taxonomy Index.
All cells on Earth resemble each other | |||
Chromosomal material |
Double-stranded DNA | ||
RNA transcription |
Common ancestral RNA polymerase | ||
Translation |
Common ancestral rRNAs and elongation factors | ||
Protein |
Common ancestral functional domains | ||
Cell structure |
Aqueous cell compartment bounded by a membrane | ||
Archaea resemble Bacteria |
|||
Cell volume |
1 to 100 μm2 (usually) |
1 to 106 μm2 | |
DNA chromosome |
Circular (usually) |
Linear | |
Gene organization |
Multi-gene operons; few introns |
Single genes; | |
Metabolism |
Denitrification, N2 fixation, lithotrophy, respiration and fermentation |
Respiration and fermentation | |
Nuclear membrane |
None (nucleoid) |
Nuclear membrane | |
Multicellularity |
Simple |
Complex | |
Archaea resemble Eukaryotes | |||
Monomolecular cell wall |
Peptidoglycan |
Absent in most species | |
Ribosome sensitivity to |
Sensitive |
Resistant | |
Translation initiator |
Formyl-Met |
Methionine (except mitochondrial F-Met) | |
RNA polymerase |
Bacterial |
Eukaryotic | |
Transcription factors |
Bacterial |
Eukaryotic | |
Archaea Differ from Bacteria and Eukaryotes | |||
Methanogenesis |
No |
Yes |
No |
Highest temperature growth |
> 90ºC |
> 110ºC |
> 60ºC |
Photosynthesis |
Many species. |
Halobacteria only; |
Many species; bacterial origin. |
Chlorophyll light absorption |
Red and blue |
Green |
Red and blue |
Membrane lipids (major) |
Ester-linked |
Ether-linked isoprenoids |
Ester-linked |
Pathogens that infect |
Many pathogens |
No pathogens |
Many pathogens |