Enzyme catalysing ATP inside flagella is

Options

A. Axonal dynein
B. Cytoplasmic dynein
C. Myosin
D. Kinesin

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the enzyme that catalyzes ATP inside flagella. This requires knowledge of the structure and function of flagella, particularly the proteins involved in their movement.

2. **Identifying the Options**: The options provided are:
- External dynein
- Cytoplasmic dynein
- Myosin
- Kinesin

3. **Analyzing Each Option**:
- **External Dynein**: This is a protein that is part of the structure of cilia and flagella. It is known to have ATPase activity, which means it can catalyze the hydrolysis of ATP. This is essential for the movement of flagella.
- **Cytoplasmic Dynein**: This protein is involved in the transport of organelles within cells but is not directly related to the movement of flagella.
- **Myosin**: This is a motor protein that converts ATP into mechanical energy, primarily in muscle contraction, but it is not involved in the movement of flagella.
- **Kinesin**: This is another motor protein that transports cellular cargo along microtubules but does not play a role in flagellar movement.

4. **Conclusion**: Based on the analysis, the enzyme that catalyzes ATP inside flagella is **External Dynein**.

5. **Final Answer**: The correct answer is **External Dynein**.

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