AIPMT-NEET Biology Aspirants, read out the next AIPMT-NEET Biology Study material/ Notes about major Differences in Bacteria, Archaea and Eukaryotes, important for AIPMT-NEET Biology. Free online notes for AIPMT-NEET.
Archaebacteria are different from bacteria/Eubacteria (true bacteria), as they can survive in harsh conditions like extreme salty regions, hot springs and marshy areas. Cell wall structure of archaea make them capable to live in these extreme conditions.
| Features | Bacteria | Archaea | Eukaryota |
| Plasmid | Yes | Yes | Rare |
| Membrane-enclosed nucleus | Absent | Absent | Present |
| Membrane-enclosed organelles | Few | Absent | Many |
| Peptidoglycan in cell wall | Present | Absent | Absent |
| Membrane lipids | Ester-linked; Unbranched hydrocarbons |
Ether-linked; Branched hydrocarbons |
Ester-linked; Unbranched hydrocarbons |
| Ribosomes | 70S | 70S | 80S |
| Initiator tRNA | Formylmethionine | Methionine | Methionine |
| Operons | Yes | Yes | Rare |
| Introns in genes | Very rare | Present in some genes |
Present in many genes |
| Number of RNA polymerases | One | One | Three |
| Growth at temperatures > 100°C |
No | Some species | No |
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