List two functions of nucleolus.

Explanation

### Step-by-Step Solution:

1. **Understanding the Nucleolus**:
- The nucleolus is a spherical structure located within the nucleoplasm of the cell nucleus. It is not membrane-bound and is composed of proteins and RNA.

2. **Function 1 - Synthesis of rRNA**:
- One of the primary functions of the nucleolus is to serve as the site for the synthesis of ribosomal RNA (rRNA). This is crucial because rRNA is a key component of ribosomes, which are essential for protein synthesis.

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