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In the light of recent classification of living organisms into three domains of life (bacteria, archaea and eukarya), which one of the following statements is true about archaea?

1. Archaea resemble eukarya in all respects
2. Archaea have some novel features that are absent in other prokaryotes and eukaryotes
3. Archaea completely differ from both prokaryotes and eukaryotes
4. Archaea completely differ from prokaryotes

Correct answer: Archaea have some novel features that are absent in other prokaryotes and eukaryotes

Solution

Archaea are a distinct domain with several unusual biochemical and genetic features not found in bacteria or eukaryotes. They are not identical to either group, but they do share some similarities with each, so the statement about novel features is correct.

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