Keratin, the protein found in nails and hair, is primarily a structural component of which tissues?

Keratin, the protein found in nails and hair, is primarily a structural component of which tissues?

• A. Skin
• B. Nails and Hair
• C. Bones
• D. Teeth

Answer: (B)

Keratin is a fibrous, structural protein that provides toughness and protection. In nails and hair, keratin is the primary structural component, forming the hard, rigid material that gives nails their strength and hair its resilience. Nails are made of hard keratin densely cross-linked, while hair consists of hard keratin that provides rigidity and durability as it grows. Bones are mainly collagen with minerals, and teeth are composed of enamel and dentin with different proteins and minerals, not keratin as the main structural element. Skin does contain keratin, but its outer layer is built from keratinocytes forming the protective epidermis rather than being the primary structural component like nails and hair.

Keratin is a fibrous, structural protein that provides toughness and protection. In nails and hair, keratin is the primary structural component, forming the hard, rigid material that gives nails their strength and hair its resilience. Nails are made of hard keratin densely cross-linked, while hair consists of hard keratin that provides rigidity and durability as it grows. Bones are mainly collagen with minerals, and teeth are composed of enamel and dentin with different proteins and minerals, not keratin as the main structural element. Skin does contain keratin, but its outer layer is built from keratinocytes forming the protective epidermis rather than being the primary structural component like nails and hair.