Haemoglobin is an example of

Options

A. blood
B. glycoprotein
C. fibrous protein
D. globular protein

Explanation

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks what type of protein hemoglobin is an example of. The options provided are blood, glycoprotein, fibrous protein, or globular protein.

2. **Understand Hemoglobin**: Hemoglobin is a protein found in red blood cells that is responsible for transporting oxygen from the lungs to the tissues and returning carbon dioxide from the tissues back to the lungs.

3. **Examine Protein Types**: There are two main types of proteins to consider:
- **Fibrous Proteins**: These are typically long, narrow, and structural in nature. Examples include collagen and keratin.
- **Globular Proteins**: These proteins are generally spherical in shape and are functional, often soluble in water. They include enzymes and transport proteins like hemoglobin.

4. **Analyze the Structure of Hemoglobin**: Hemoglobin has a compact, irregular structure with alpha and beta chains and contains iron in the heme group. This structure is characteristic of globular proteins.

5. **Conclude the Classification**: Based on its structure and function, hemoglobin fits the definition of a globular protein. Therefore, the correct answer is that hemoglobin is an example of a globular protein.

6. **Final Answer**: Hemoglobin is a globular protein.

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