Question

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

• A. archaea completely differ from both prokaryotes and eukaryotes
• B. archaea have some novel features that are absent in other prokaryotes and eukaryotes
• C. archaea resemble eukarya in all respects
• D. archaea completely differ from prokaryotes

Answer 1

The correct option is B

archaea have some novel features that are absent in other prokaryotes and eukaryotes

The correct option is B.

Explanation for the correct answer:

1. Archaea represents the third domain of life which includes the characteristics that are absent in prokaryotes and eukaryotes.
2. They are organisms that are found in extreme conditions.

Explanation for the incorrect answers:

Option A:

1. Archaea are not completely different from the prokaryotic and eukaryotic organisms.
2. Archaea and bacteria both do not have membrane-bound organelles and nuclei.
3. Archaea resembles eukarya as both possess genes and have several metabolic pathways.

Option C:

1. Archaea do not have a true nucleus and membrane-bound organelle but eukarya have a proper nucleus and membrane-bound organelles.

Option D:

1. Archaea and prokaryotes both are the same in respect of their structural configuration.
2. Both lacked well-defined nuclei and organelles in their cytoplasm.

Final answer: Archaea is the third domain of life which resembles both prokaryotes and eukaryotes but has some novel features which are absent in prokarya and eukarya the other domain that help the archaea to survive in the extreme condition.