The spindle fibres are made up of _______________ protein.
(a) Myoglobin
(b) Tubulin
(c) Albumin
(d) Myosin

Options

A. Myoglobin
B. Tubulin
C. Albumin
D. Myosin

Answer

To solve the question "The spindle fibres are made up of _______________ protein," we need to analyze the provided options and understand what spindle fibers are composed of.

### Step-by-Step Solution:

1. **Understanding Spindle Fibers**:
- Spindle fibers are structures that play a crucial role during cell division (mitosis and meiosis). They help in the movement and separation of chromosomes.

2. **Analyzing the Options**:
- **(a) Myoglobin**: This is a protein found in muscle tissue that binds oxygen. It is not related to spindle fibers.
- **(b) Tubulin**: This is a protein that polymerizes to form microtubules, which are the structural components of spindle fibers.
- **(c) Albumin**: This is a protein found in egg whites and blood plasma, primarily involved in maintaining osmotic pressure. It does not relate to spindle fibers.
- **(d) Myosin**: This is a protein involved in muscle contraction and movement but is not a component of spindle fibers.

3. **Identifying the Correct Answer**:
- The only option that directly relates to the structure of spindle fibers is **(b) Tubulin**. Tubulin proteins assemble to form microtubules, which make up the spindle fibers.

4. **Conclusion**:
- Therefore, the correct answer is **(b) Tubulin**.

### Final Answer:
The spindle fibres are made up of **Tubulin** protein.

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