Which one of the following also acts as a catalyst in a bacterial cell?

Options

A. 5 sr RNA
B. sn RNA
C. hn RNA
D. 23 sr RNA

Answer

To solve the question "Which one of the following also acts as a catalyst in a bacterial cell?", we will analyze each option provided:

1. **Understanding the Options**:
- **Option A: 5S rRNA**: This is a component of the large subunit of the ribosome. However, it does not have catalytic activity.
- **Option B: SnRNA**: This stands for small nuclear RNA, which is involved in RNA processing but does not act as a catalyst in bacterial cells.
- **Option C: HnRNA**: Heterogeneous nuclear RNA is a precursor to mRNA and does not have catalytic properties.
- **Option D: 23S rRNA**: This is also a component of the ribosome and is known to have peptidyl transferase activity, which means it can catalyze the formation of peptide bonds during protein synthesis.

2. **Identifying the Correct Answer**:
- Since we are looking for an RNA that acts as a catalyst in bacterial cells, we find that **23S rRNA** is the only option that fits this criterion due to its catalytic role in peptide bond formation.

3. **Conclusion**:
- The correct answer is **Option D: 23S rRNA**.