Which of the given features of archaebacteria resembles eukaryotes

Options

A. incipient nucleus
B. introns
C. 80s ribosomes
D. cyclosis

Answer

To solve the question "Which of the given features of archaebacteria resembles eukaryotes?", we will analyze the features of archaebacteria and compare them to those of eukaryotes.

### Step-by-Step Solution:

1. **Understanding Archaebacteria and Eukaryotes**:
- Archaebacteria are a group of prokaryotic microorganisms that are distinct from bacteria and eukaryotes. They are classified under the kingdom Monera.
- Eukaryotes are organisms whose cells have a true nucleus and membrane-bound organelles. They belong to various kingdoms, including Protista, Fungi, Plantae, and Animalia.

2. **Identifying Key Features**:
- **True Nucleus**: Eukaryotes have a true nucleus, while archaebacteria typically have an incipient nucleus.
- **Introns**: Introns are non-coding segments of DNA found within genes. Both archaebacteria and eukaryotes contain introns.
- **Ribosomes**: Eukaryotes have 80S ribosomes, while prokaryotes (including archaebacteria) have 70S ribosomes.
- **Core Histone Proteins**: Some archaebacteria, like Methanococcus, have histone proteins, which are also present in eukaryotes.
- **First Amino Acid in Protein Synthesis**: Methionine is the first amino acid in protein synthesis in both archaebacteria and eukaryotes.
- **Cyclosis**: This is the streaming of cytoplasm, which is a feature of eukaryotic cells and not found in prokaryotes.

3. **Comparing Features**:
- From the analysis, we can see that:
- **Introns** are present in both archaebacteria and eukaryotes.
- **Core histone proteins** are found in some archaebacteria and eukaryotes.
- **Methionine** as the first amino acid is common in both.
- Other features like true nucleus and cyclosis do not apply to archaebacteria.

4. **Conclusion**:
- The feature that resembles between archaebacteria and eukaryotes is **introns**. Therefore, the answer to the question is **introns**.

### Final Answer:
The feature of archaebacteria that resembles eukaryotes is **introns**.