Mark the globular protein in the following

Options

A. Collagen
B. Myoglobin or Haemoglobin
C. Myosin
D. Fibroin

Answer

To identify the globular protein from the given options, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Protein Classification**: Proteins can be classified into two main categories based on their structure: fibrous proteins and globular proteins. Fibrous proteins are elongated and typically serve structural roles, while globular proteins are more spherical and often function as enzymes or transport proteins.

2. **Analyze the Options**: The question provides four options. We need to evaluate each option to determine whether it is a globular protein or a fibrous protein.

3. **Identify Collagen**: The first option is collagen. Collagen is a fibrous protein found in connective tissues, such as tendons and skin. Therefore, it is not the globular protein we are looking for.

4. **Identify Myoglobin and Hemoglobin**: The next option is myoglobin or hemoglobin. Both of these proteins are globular proteins. They have a spheroidal shape and are involved in oxygen transport in the body. This indicates that this option is indeed a globular protein.

5. **Identify Myosin**: The third option is myosin. Myosin is a fibrous protein that plays a crucial role in muscle contraction. Hence, it is not a globular protein.

6. **Identify Fibroin**: The last option is fibroin, which is also a fibrous protein found in silk. Like collagen and myosin, it does not qualify as a globular protein.

7. **Conclusion**: Based on the analysis, the globular protein among the options provided is myoglobin or hemoglobin.

### Final Answer:
The globular protein is **myoglobin or hemoglobin**.

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