Inspection of domain Archaea shows that two sub-divisions exist the Euryarchaeota and the Crenarchaeota. The Archaea are chemotrophic although Halobacterium can use light to make ATP. Many others are chemolithotrophs with hydrogen gas being a widely used energy source. The Euryarchaeota includes Methanobacterium, Methanocaccus, Thermocaccus. The differential features among bacteria, Archaea and Eukarya are: 
Thermococcus, Methanococcus and Methanobacterium examplify
NEET UG 2008 — Botany Biological Classification
2008mcqeasy
Thermococcus, Methanococcus and Methanobacterium examplify
Official previous-year question
Held on 30 Apr 2008 · Verified 9 Jul 2026.
Options
- A
archabacteria that contain protein homologous to eukaryotic core histones
- B
archaebacteria that lack any histones resembling those found in eukaryotes but whose DNA is negatively supercoiled
- C
bacteria whose DNA is relaxed or positively supercoiled but which have a cytoskeleton as well as mitochondria
- D
bacteria that contain a cytoskeleton and ribosomes
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