Nucleolus in Eukaryotic cell is

Options

A. Nonliving
B. Visible at Metaphase
C. Bounded by a membrane
D. The site of packaging of r-RNA with proteins

Answer

### Step-by-Step Solution:

1. **Understanding the Nucleolus**: The nucleolus is a prominent structure within the nucleus of eukaryotic cells. It plays a crucial role in the synthesis and assembly of ribosomes.

2. **Membrane Bound Status**: One of the key characteristics of the nucleolus is that it is **not bounded by a membrane**. This means that it does not have a surrounding membrane like other organelles (e.g., the nucleus or mitochondria).

3. **Composition of the Nucleolus**: The nucleolus is composed of a dense fibrillar region where RNA and ribosomal proteins are concentrated. This region is involved in the assembly of ribosomal subunits.

4. **Function of the Nucleolus**: The primary function of the nucleolus is to serve as a **site for the packaging of RNA with proteins** to form ribosomal units, which are essential for protein synthesis in the cell.

5. **Visibility During Cell Division**: The nucleolus is **not visible during metaphase** of cell division. During this stage, the chromatin condenses into chromosomes, and the nucleolus typically disappears.

6. **Living Structure**: The nucleolus is considered a **living structure** as it is actively involved in cellular processes, particularly in the synthesis of ribosomes.

7. **Conclusion**: Based on the characteristics and functions discussed, the correct answer to the question about the nucleolus in eukaryotic cells is that it is a **site where RNA is packed with proteins**.

### Final Answer:
The nucleolus in eukaryotic cells is a site where RNA is packed with proteins.

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