Distinguish between nucleolus and nucleus

Explanation

To distinguish between nucleolus and nucleus, we can compare their definitions, structures, functions, and locations within the cell. Here’s a step-by-step breakdown:

### Step 1: Definition
- **Nucleolus**: The nucleolus is a dense, spherical structure found within the nucleus. It is not surrounded by a membrane and is primarily composed of RNA and proteins.
- **Nucleus**: The nucleus is a membrane-bound organelle that contains the cell's genetic material (DNA) and is responsible for regulating gene expression and cell division.

### Step 2: Structure
- **Nucleolus**: The nucleolus is a non-membrane-bound structure that appears as a dark-staining region within the nucleus. It is rich in RNA and proteins.
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