Class 12 Biology Ecology Kingdom - Monera And Viruses
Thermococcus, Methanobacterium exemplify,
(a)
archaebacteria 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 mitochondria
(d)
bacteria that contain a cytoskeleton and ribosomes
Correct answer: (a) 
Solution: Inspection of domain Archaea shows that two sub-divisions exist, the Euryarchaeota and the Crenarchaeota. The Euryarchaeota includes Methanobacterium, Mthanococcus, Thermococcus.

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