Which of the following is not a globular protein?

Options

A. Myosin
B. Insulin
C. Haemoglobin
D. Albumin

Explanation

To determine which of the following is not a globular protein, we need to analyze the options provided: Myosin, Insulin, Hemoglobin, and Albumin.

### Step-by-Step Solution:

1. **Understanding Globular Proteins**:
- Globular proteins are characterized by their spherical shape, which is formed when polypeptide chains coil and fold into a compact structure. This shape is crucial for their function, as it allows them to be soluble in water and perform various biological roles.

2. **Identifying the Proteins**:
- **Insulin**: This is a globular protein that regulates glucose levels in the blood. It has a compact, spherical structure.
- **Hemoglobin**: This is another globular protein that carries oxygen in the blood. It also has a spherical shape and is soluble in water.
- **Albumin**: This is a globular protein found in blood plasma, responsible for maintaining osmotic pressure and transporting substances. It is also spherical in shape.

3. **Analyzing Myosin**:
- **Myosin**: This protein is primarily involved in muscle contraction and is classified as a fibrous protein. Fibrous proteins have elongated, thread-like structures and are typically insoluble in water. Myosin does not have the spherical shape characteristic of globular proteins.

4. **Conclusion**:
- Among the given options, Myosin is the only protein that is not a globular protein. Therefore, the correct answer is Myosin.

### Final Answer:
**Myosin is not a globular protein.**