How does the secondary structure of collagen differ from that of alpha keratin?

• A. Collagen forms spherical shapes, while alpha keratin forms linear strands.
• B. Collagen has a triple helix structure, while alpha keratin has a coiled coil motif.
• C. Collagen is composed of alpha helices, while alpha keratin is composed of beta sheets.
• D. Collagen is soluble in water, while alpha keratin is insoluble.

Answer: (B)