A) archaebacteria that contain protein homologous to eukaryotic core histones
B) archaebacteria that lack any histones resembling those found in eukaryotes but whose DNA is negatively supercoiled
C) bacteria whose DNA is relaxed or positively supercoiled but which have a cytoskeleton as well as mitochondria
D) bacteria that contain a cytoskeleton and ribosomes
Correct Answer: A
Solution :
Inspection of domain Archaea shows that two sub-divisions exist the Euryarchaeota and the Crenarchaeota. The Archaea are chemotrophic although Hat bacterium can use light to make ATP. Many others 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 proteins | No | Yes | Yes |
| Membrane bound nucleus | No | No | Yes |
| Ribosome | 70S | 70S | 80S and 70S |
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