Which part of myosin is an active ATP ase enzyme?

Explanation

To answer the question "Which part of myosin is an active ATPase enzyme?", we can break down the information as follows:

### Step-by-Step Solution:

1. **Understanding Myosin Structure**: Myosin is a motor protein that is primarily involved in muscle contraction and movement. It is composed of three main parts: the head, neck, and tail domains.

2. **Identifying the Function of Each Domain**:
- **Head Domain**: This part is crucial for the interaction with actin filaments and is responsible for the ATPase activity.
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