Which one is true about domain archaea?

Options

A. They differ from both prokaryotes and eukaryotes
B. They completely differ from prokaryotes
C. They resemble eukarya in all aspects
D. They have some novel features absent in other prokaryotes and eukaryotes.

Answer

To determine which statement is true about the domain Archaea, we can analyze the characteristics of Archaea in relation to Prokaryotes and Eukaryotes.

### Step-by-Step Solution:

1. **Understanding Archaea**:
- Archaea are a group of microorganisms that are classified under the domain Archaea. They are prokaryotic, meaning they lack a true nucleus and membrane-bound organelles.

2. **Comparison with Prokaryotes**:
- While Archaea are indeed prokaryotes, they have unique features that distinguish them from other prokaryotes (like bacteria). For example, they can thrive in extreme environments such as high salinity (halophiles), high temperatures (thermoacidophiles), and they can produce methane (methanogens).

3. **Comparison with Eukaryotes**:
- Eukaryotes, on the other hand, have a true nucleus and membrane-bound organelles. Archaea do not share these characteristics, which makes them fundamentally different from Eukaryotes.

4. **Evaluating the Options**:
- **Option A**: "They differ from both Prokaryotes and Eukaryotes." - This is incorrect because Archaea are a type of prokaryote.
- **Option B**: "They completely differ from Prokaryotes." - This is also incorrect as they are prokaryotes.
- **Option C**: "They resemble Eukaryotes in all aspects." - This is incorrect since they do not have a true nucleus or membrane-bound organelles like Eukaryotes.
- **Option D**: "They have some novel features absent in other Prokaryotes and Eukaryotes." - This is correct. Archaea possess unique adaptations that are not found in other prokaryotes or eukaryotes.

5. **Conclusion**:
- The correct statement about the domain Archaea is that they have some novel features absent in other Prokaryotes and Eukaryotes.

### Final Answer:
- **Option D**: "They have some novel features absent in other Prokaryotes and Eukaryotes" is the true statement about domain Archaea.