Multiple choice

The protein fibroin is composed of

  1. triple helix

  2. double helix

  3. helix-turn-helix motif

  4. �-pleated sheet
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Fibroin is the main structural protein in silk, produced by silkworms and spiders. Its secondary structure is dominated by beta-pleated sheets arranged in an antiparallel fashion, which gives silk its strength and flexibility. Triple helices are found in collagen, double helices in DNA, and helix-turn-helix is a DNA-binding motif.

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