Some monerans are prokaryotic.

Answer

### Step-by-Step Solution:

1. **Understanding Monerans**:
- Monerans are classified under the kingdom Monera, which primarily includes all types of bacteria.

2. **Prokaryotic Nature**:
- Prokaryotic organisms are characterized by the absence of a defined nucleus and membrane-bound organelles. This is a key feature that distinguishes them from eukaryotic organisms.

3. **Classification of Monerans**:
- The kingdom Monera is divided into two main groups: Archaea and Eubacteria.
- **Archaea**: These are often referred to as "ancient" bacteria and can thrive in extreme environments (e.g., acidophiles, thermophiles).
- **Eubacteria**: These are the more common bacteria that are used in various industrial applications (e.g., methanogens, nitrogen fixers).

4. **Characteristics of Prokaryotes**:
- All monerans, being prokaryotes, lack a true nucleus and nuclear membrane. They also do not have membrane-bound organelles, which is a defining characteristic of prokaryotic cells.

5. **Conclusion**:
- Therefore, it can be concluded that all monerans are indeed prokaryotic organisms, belonging to the domains Archaea and Eubacteria.