Q. $Thermococcus,\ Methanococcus$ and $Methanobac - terium$ 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 as mitochondria
D) Bacteria that contain a cytoskeleton and ribosomes
Explanation
Inspection of domain Archaea shows that two sub-divisions exist; the Euryarchaeota and the Crenarchaeota. The Euryarchaeota includes $Methanobacterium,\ Methanococcus,\$ $Thermococcus$.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.