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Difference between Bacteria, Archaea and Eukaryota

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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