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Thermococcus, Methanococcus and Methanobacterium exemplify:

  1. A
    Bacteria that contain a cytoskeleton and ribosomes
  2. B
    Archaebacteria that contain protein homologous to eukaryotic core histones
  3. C
    Archaebacteria that lack any histones resembling those found in eukaryotes but whose DNA is negatively supercoiled
  4. D
    Bacteria whose DNA is relaxed or positively supercoiled but which have a cytoskeleton as well as mitochondria

Solution & Step-by-step Explanation

These organisms are Archaebacteria. While they are prokaryotic, their DNA is associated with proteins that are chemically different from eukaryotic histones, and their DNA is typically negatively supercoiled.

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Thermococcus, Methanococcus and Methanobacterium exemplify:
A
Bacteria that contain a cytoskeleton and ribosomes
B
Archaebacteria that contain protein homologous to eukaryotic core histones
C
Archaebacteria that lack any histones resembling those found in eukaryotes but whose DNA is negatively supercoiled
D
Bacteria whose DNA is relaxed or positively supercoiled but which have a cytoskeleton as well as mitochondria

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Biological ClassificationArchaebacteriaMethanogens

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