Cytoskeleton

Question

Microtubules are composed of which protein subunits?

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1. **Cytoskeleton**: A network of protein fibers in the cytoplasm providing structural support and motility.
2. **Microtubules**: These are the thickest fibers, hollow tubes with a diameter of about $25 \ nm$.
3. **Composition**: They are polymers made of globular protein subunits called **tubulin**. Each microtubule consists of **tubulin dimers** (each dimer has an $\alpha$-tubulin and a $\beta$-tubulin polypeptide).
4. **Other Fibers**:
   - **Microfilaments**: Composed of actin monomers.
   - **Intermediate Filaments**: Composed of various fibrous proteins like keratin.

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Cytoskeleton

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