Tubulin protein occurs in

Options

A. enzymes
B. RER
C. microtubules and cilia
D. microfilaments and microvilli

Answer

**Step-by-Step Solution:**

1. **Understanding Tubulin Protein**: Tubulin is a protein that is a key component of the cytoskeleton in eukaryotic cells. It is primarily known for its role in forming microtubules.

2. **Identifying the Options**: The question provides four options:
- A) Enzyme
- B) Rough Endoplasmic Reticulum
- C) Microtubules and Cilia
- D) Microfilaments and Micro

3. **Analyzing Each Option**:
- **Option A (Enzyme)**: Tubulin is not an enzyme; it does not catalyze biochemical reactions.
- **Option B (Rough Endoplasmic Reticulum)**: While the rough endoplasmic reticulum is involved in protein synthesis, it does not contain tubulin.
- **Option C (Microtubules and Cilia)**: Microtubules are composed of tubulin proteins, and cilia are structures that contain microtubules.
- **Option D (Microfilaments and Micro)**: Microfilaments are made of actin, not tubulin.

4. **Conclusion**: Based on the analysis, the correct answer is **Option C: Microtubules and Cilia**. Tubulin proteins are essential components of microtubules, which are part of the cytoskeleton and are also found in cilia.

5. **Final Answer**: Therefore, tubulin protein occurs in **Microtubules and Cilia**.

---