Explain the structure and function of nucleolus

Explanation

### Step-by-Step Solution:

1. **Introduction to Nucleolus**:
- The nucleolus is a prominent structure found within the nucleus of eukaryotic cells. It is not surrounded by a membrane and is a key component of the cell's machinery.

2. **Structure of Nucleolus**:
- The nucleolus is typically small and spherical in shape. It is composed of proteins, RNA, and DNA. The nucleolus can be observed as a dense region within the nucleus and is often more prominent during certain stages of the cell cycle.

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