Multiple choice general knowledge

Feathers are made up of an insoluble protein called...?

  1. Calamus

  2. Keratin

  3. Down

  4. Cartilage
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Feathers are primarily composed of keratin, the same insoluble structural protein that makes up hair, nails, and horns in mammals. Keratin provides feathers with their strength, flexibility, and resistance to wear. The calamus is the hollow shaft at the feather's base, down refers to soft under feathers, and cartilage is a different structural tissue found in vertebrates.

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