Ownclasses

Thermococcus, Methanococcus and Methanobacterium emplify

  • archaebacteria that contain protein homologous to eukaryotic core histones

  • archaebacteria that lack any histones resembling those found in eukaryotes but DNA is negatively supercoiled

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

  • bacteria that contain a cytoskeleton and ribosomes

Answer

A.

archaebacteria that contain protein homologous to eukaryotic core histones

Inspection of domain Archaea shows that two sub-divisions exist the Euryarchaeota and the Crenarchaeota. The Archaea are chemotrophic although Halobacterium can use light to make ATP. Many other are chemolithotrophs with ATP. Many other are chemolithotrophs with hydrogen gas being a widely used energy source.The Euryarchaeota includes Methanobacterium, Methanococcus, Thermococcus. The differential features among bacteria, Archaea and Eukarya are:

Characteristic

Bacteria

Archaea

Eukarya

Prokaryotic cell

Yes

Yes

No

Circular DNA

Yes

Yes

No

Histone protein

No

Yes

Yes

Membrane-bound Nucleus

No

NO

Yes

Ribosome

70S

70S

80S and 70S

 

 

Inspection of domain Archaea shows that two sub-divisions exist the Euryarchaeota and the Crenarchaeota. The Archaea are chemotrophic although Halobacterium can use light to make ATP. Many other are chemolithotrophs with ATP. Many other are chemolithotrophs with hydrogen gas being a widely used energy source.The Euryarchaeota includes Methanobacterium, Methanococcus, Thermococcus. The differential features among bacteria, Archaea and Eukarya are:

Characteristic

Bacteria

Archaea

Eukarya

Prokaryotic cell

Yes

Yes

No

Circular DNA

Yes

Yes

No

Histone protein

No

Yes

Yes

Membrane-bound Nucleus

No

NO

Yes

Ribosome

70S

70S

80S and 70S