Mesokaryon is

Options

A. A nucleus like structure
B. Nucleoid with histone protein
C. A nucleus with condensed chromosomes
D. A nucleoid with distinct chromosomes.

Answer

**Step-by-Step Solution:**

1. **Understanding the Term "Mesokaryon":**
- The term "mesokaryon" refers to a type of nucleus that is well-developed. The suffix "karyon" means nucleus, indicating that we are discussing the characteristics of the nucleus in certain organisms.

2. **Characteristics of Mesokaryon:**
- In organisms classified as mesokaryon, the nucleus is well-developed, which means it has a nuclear membrane. This is a key feature that distinguishes eukaryotic cells from prokaryotic cells.

3. **Presence of Condensed Chromosomes:**
- Mesokaryon organisms also possess condensed chromosomes. This means that during cell division, the genetic material is organized into distinct structures, which is a characteristic of eukaryotic cells.

4. **Analyzing the Options:**
- **Option 1:** "Nucleus-like structure" - This is incorrect because a mesokaryon has a well-defined nucleus, not just a nucleus-like structure.
- **Option 2:** "Nucleoid with histone protein" - This is incorrect because a nucleoid indicates an undeveloped nucleus typical of prokaryotic cells, which does not apply to mesokaryon.
- **Option 3:** "A nucleus with condensed chromosomes" - This is correct as it aligns with the definition of mesokaryon, where the nucleus is well-developed and has condensed chromosomes.
- **Option 4:** "Nucleoid with distinct chromosomes" - This is incorrect since a nucleoid suggests a lack of a well-defined nucleus, which contradicts the definition of mesokaryon.

5. **Conclusion:**
- Based on the analysis, the correct answer is **Option 3: A nucleus with condensed chromosomes**.

---