The carbohydrate molecule cellulose is a ...................

Explanation

**Step-by-Step Solution:**

1. **Identify the Type of Carbohydrate:**
- Cellulose is classified as a carbohydrate. Carbohydrates can be simple (monosaccharides) or complex (polysaccharides).

2. **Understand the Structure of Cellulose:**
- Cellulose is a polysaccharide, which means it is made up of long chains of monosaccharides. In the case of cellulose, these monosaccharides are glucose molecules.

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