The protists have

Options

A. Only free nucleic acid aggregates
B. Membrane bound nucleoproteins lying embedded in the cytoplasm
C. Gene containing nucleoproteins condensed together in loose mass
D. Nucleoprotein in direct contact with the rest of the cell substance

Answer

### Step-by-Step Solution:

1. **Understanding the Kingdom Protista**:
- The kingdom Protista consists of a diverse group of eukaryotic organisms, which include protozoans and algae like Euglena.

2. **Characteristics of Protists**:
- Protists are eukaryotic, meaning they have a well-developed nucleus.
- They possess various cell organelles that are bounded by membranes.
- These organelles include membrane-bound nucleoproteins.

3. **Analyzing the Options**:
- **Option 1**: "Only free nucleic acid aggregates" - This is incorrect because protists have a well-defined nucleus, not just free nucleic acids.
- **Option 2**: "Membrane bound nucleoprotein lying embedded in the cytoplasm" - This is correct as it describes the presence of membrane-bound nucleoproteins in protists.
- **Option 3**: "Gene containing nucleoprotein condensed together in a loose mass" - This is incorrect since protists have organized structures rather than loose aggregates.
- **Option 4**: "Nucleoprotein in direct contact with the rest of the cell substances" - This is incorrect because the nucleoproteins in protists are membrane-bound and not in direct contact with the cytoplasm.

4. **Conclusion**:
- The correct answer is **Option 2: Membrane bound nucleoprotein lying embedded in the cytoplasm**.