When certain prokaryotes were first identified and categorized as archaea, it was thought by many that...
When certain prokaryotes were first identified and categorized as archaea, it was thought by many that the archaea represented a group of bacteria that were more ancient than the eubacteria (which at the time were simply called “bacteria”). Why do you think this is the case?
Homework Answers
Answer:
- Archaea is derived from the Greek word archaios meaning "ancient one". Archaea were originally discovered in extreme environments, such as hydrothermal vents and terrestrial hot springs.
- First identified and categorized Archaea were methanogens, residing in environment which reflected Earth's primitive conditions. Hence, it was thought they were more ancient than the eubacteria.
- As new habitats were studied, more archaea were discovered. Now, Archaea are believed to have evolved from gram-positive bacteria.
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