Thermococcus, Methanococcus and Methanobacterium are

Archaebacteria having eukaryotic histone homologue

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Bacteria with cytoskeleton

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Archaebacteria with negatively supercoiled DNA as in eukaryotes but lacking histones.

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Bacteria with positively coiled DNA, cytoskeleton and mitochondria.

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Solution

The correct option is D Archaebacteria with negatively supercoiled DNA as in eukaryotes but lacking histones.
Thermococcus, Methanococcus and Methanobacterium are Archaebacteria. They lack histones. They have negatively supercoiled DNA. They differ from bacteria in a way that they survive extreme conditions. Unlike bacteria, archaea cell walls do not contain peptidoglycan.
Thus, the correct answer is option C.

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Structure made up of 8 histone molecules with DNA coiled around it.

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