Question

Which of the following is NOT an example of fibrous protein ?

• A. Keratin
• B. Albumin
• C. Myosin
• D. Collagen

Hint:

Think of solubility: If it's a structural component of your body (like hair or skin), it's likely a water-insoluble fibrous protein. If it's floating in your blood or cytoplasm (like enzymes or albumin), it's a water-soluble globular protein.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Proteins are classified into two broad categories based on their molecular shape and solubility: Fibrous and Globular.
Step 2: Detailed Explanation:
Fibrous Proteins: These consist of polypeptide chains that run parallel and are held together by hydrogen and disulfide bonds to form thread-like or fiber-like structures. They are generally insoluble in water and serve structural roles.
- Keratin: Found in hair, wool, and silk.
- Myosin: Found in muscles.
- Collagen: Found in tendons, skin, and connective tissues.
Globular Proteins: These result when the chains of polypeptides fold around to give a spherical shape. They are usually soluble in water and perform functional/regulatory roles.
- Albumin: Found in egg white and blood serum.
- Insulin: A hormone.
Step 3: Final Answer:
Albumin is an example of a globular protein, not a fibrous protein.