Thermococcus, Methanococcus and Methanobacterium are

Options

A. Bacteria whose DNA is relaxed or positively supercoiled but which has a cytoskeleton as well as motochondria
B. Bacteria that contain a cytoskeleton and ribosome
C. Archaebacteria that contain proteins homologous to eukaryotic core histones
D. Archaebacteria that lack any hisstones resembling those found in eukaryotes but whose DNA is negatively supercoiled.

Answer

D