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Thermococcus, Methanococcus and Methanob...

Thermococcus, Methanococcus and Methanobacterium are

A

bacteria whose DNA is relaxed or positively supercoiled but which have a cytoskeleton as well as mitochondria

B

bacteria that contains protein homologous to eukaytic core histones

C

archaebateria that contains protein homologus to ekaryotic core histones

D

archaenacteria that lack any histones resembing those found in eukaryotes but whose DNA is negatively supercoiled.

Text Solution

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The correct Answer is:
D
Thermococcus, Methanococcus and Methanobucterium exemplify archaebacteria that lack any histones resembling those found in eukaryotes but whose DNA is negatively supercoiled. Archaebacteria do not have a nucleus, the genetic material floats freely in the cytoplasm. They consist of ribosomal RNA. DNA contains a single, circular molecule, which is compact and tightly wound. No protein is associated with DNA. The archaebacterial cell may contain plasmids, which are small, circular pieces of DNA and have a highly negatively supercoiled DNA.
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