Which of the following does NOT contain a structural protein?

• A. Hair
• B. Egg white
• C. Spider silk
• D. Tendons

Answer: (B)

Verified step by step guidance

1. Step 1: Understand the concept of structural proteins. Structural proteins are proteins that provide support, strength, and shape to cells and tissues. Examples include keratin (found in hair and nails), collagen (found in tendons and connective tissues), and fibroin (found in spider silk).
2. Step 2: Analyze each option provided in the question. Hair contains keratin, which is a structural protein. Tendons contain collagen, another structural protein. Spider silk contains fibroin, which is also a structural protein.
3. Step 3: Consider the composition of egg white. Egg white primarily contains albumin, which is a globular protein involved in storage and transport rather than structural support.
4. Step 4: Compare the functions of the proteins in each option. Structural proteins are specifically involved in providing physical support and strength, whereas albumin in egg white serves a different biological role.
5. Step 5: Conclude that egg white does NOT contain a structural protein, as its primary protein (albumin) is not involved in structural support.