How does keratin in nails compare to keratin in skin or hair?

• A. It is softer than keratin in skin
• B. It is harder than keratin in skin or hair
• C. They are the same in hardness
• D. It is more flexible than in skin or hair

Answer: (B)

Keratin is a fibrous structural protein that is a key component of nails, skin, and hair. The keratin found in nails is more specialized and has a different structure than that found in skin and hair, contributing to its hardness.

Keratin in nails has a dense, layered structure that provides strength and rigidity, making nails harder and more durable. This is essential for their protective function, as nails need to withstand daily wear and impact. In contrast, the keratin in skin is designed to be flexible and serve as a protective barrier, while the keratin in hair is primarily concerned with providing some degree of strength and flexibility without the same level of hardness.

Therefore, the statement that keratin in nails is harder than keratin in skin or hair accurately reflects the unique properties of nail keratin, which is specifically adapted for durability and protection.