All of the following are found in a prokaryotic cell, except

Options

A. mRNA
B. rRNA
C. snRNA
D. Simultaneous transcription and translation.

Answer

To solve the question, "All of the following are found in a prokaryotic cell, except," we need to analyze the options provided and identify which one is not present in prokaryotic cells.

### Step-by-Step Solution:

1. **Identify the Types of RNA in Prokaryotic Cells**:
- Prokaryotic cells, such as bacteria, contain several types of RNA. The three major types are:
- **mRNA (messenger RNA)**: Carries genetic information from DNA to ribosomes for protein synthesis.
- **tRNA (transfer RNA)**: Helps in the translation process by bringing amino acids to the ribosome.
- **rRNA (ribosomal RNA)**: A component of ribosomes, essential for protein synthesis.

2. **Evaluate the Options**:
- The question mentions mRNA, rRNA, snRNA, and simultaneous transcription and translation. We need to determine which of these is not found in prokaryotic cells.
- **mRNA**: Present in prokaryotic cells.
- **rRNA**: Present in prokaryotic cells.
- **snRNA (small nuclear RNA)**: This type of RNA is involved in RNA splicing and is found in eukaryotic cells, not prokaryotic cells.
- **Simultaneous transcription and translation**: This occurs in prokaryotic cells because both processes happen in the cytoplasm without compartmentalization.

3. **Conclusion**:
- The only option that is not found in prokaryotic cells is **snRNA**.

### Final Answer:
- **snRNA** is the correct answer as it is not found in prokaryotic cells.