Which of the following types of ribosomal RNA is not present in eukaryotic cytoplasm ?

Options

A. 18S
B. 28S
C. 5.8S
D. 16S

Answer

To solve the question "Which of the following types of ribosomal RNA is not present in eukaryotic cytoplasm?", we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Types of Ribosomal RNA**:
- Understand that there are different types of ribosomal RNA (rRNA) present in cells. The main types include 18S, 28S, 5.8S, and 5S in eukaryotes.

2. **Understand Eukaryotic Cytoplasm**:
- Eukaryotic cells, such as those in fungi and algae, contain ribosomal RNA. The specific types of rRNA present in the cytoplasm of eukaryotic cells include:
- 18S rRNA
- 28S rRNA
- 5.8S rRNA
- 5S rRNA

3. **Identify the Ribosomal RNA Not Present in Eukaryotic Cytoplasm**:
- The question asks which type of rRNA is not found in the eukaryotic cytoplasm.
- The 16S rRNA is known to be present in prokaryotic cells (like bacteria) and is not found in eukaryotic cells.

4. **Conclusion**:
- Therefore, the type of ribosomal RNA that is not present in eukaryotic cytoplasm is **16S rRNA**.

### Final Answer:
The ribosomal RNA that is not present in eukaryotic cytoplasm is **16S rRNA**.

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