Differentiate between the chemical nature of microtubules and microfilaments.

Explanation

### Step-by-Step Text Solution:

1. **Definition of Microtubules and Microfilaments**:
- Microtubules and microfilaments are both types of protein structures found in cells that play crucial roles in maintaining cell shape and facilitating movement.

2. **Chemical Composition**:
- **Microtubules**:
- Composed of the protein **tubulin**.
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