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 regarding what is not found in a prokaryotic cell, we will analyze the options provided and identify the correct answer step by step.

### Step-by-Step Solution:

1. **Understanding Prokaryotic Cells**: Prokaryotic cells are simple, unicellular organisms that lack a membrane-bound nucleus. The most common examples of prokaryotic cells are bacteria.

2. **Identifying Components of Prokaryotic Cells**: Prokaryotic cells contain various cellular components, including:
- Ribosomes (for protein synthesis)
- Genetic material (DNA)
- RNA types (mRNA, tRNA, rRNA)
- Cell membrane and cell wall

3. **Analyzing the RNA Types**:
- **mRNA (messenger RNA)**: Present in prokaryotic cells; it carries genetic information from DNA to ribosomes.
- **tRNA (transfer RNA)**: Present in prokaryotic cells; it helps in the translation process by bringing amino acids to the ribosomes.
- **rRNA (ribosomal RNA)**: Present in prokaryotic cells; it is a component of ribosomes, which are essential for protein synthesis.
- **snRNA (small nuclear RNA)**: This type of RNA is primarily involved in the processing of pre-mRNA and is found in eukaryotic cells, not prokaryotic cells.

4. **Evaluating the Last Option**: The question also mentions simultaneous transcription and translation. In prokaryotic cells, these processes occur in the same compartment (the cytosol) and can happen simultaneously due to the lack of a nuclear membrane.

5. **Conclusion**: Since mRNA, tRNA, rRNA, and simultaneous transcription and translation are all present in prokaryotic cells, the only option that is not found in prokaryotic cells is snRNA.

### Final Answer:
The correct answer is **snRNA** (small nuclear RNA), as it is not found in prokaryotic cells.

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