Compared to Beta keratin, Alpha keratin _________.

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Multiple Choice

Compared to Beta keratin, Alpha keratin _________.

Explanation:
Understanding how protein structure shapes material properties helps explain this. Alpha keratin is built from alpha-helical, coiled-coil regions that allow the chains to slide past each other a bit and bend without breaking, giving hair, skin, and nails their flexible, softer feel. Beta keratin, by contrast, forms tightly packed beta-pleated sheets that stack into stiff, rigid fibers, which makes structures composed of it much harder and less pliable. Because of this difference, alpha keratin is softer than beta keratin. The other options don’t fit as well: beta keratin’s rigidity wouldn’t be described as softer, and while elasticity or brittleness relate to structure, the clearest contrast here is softness due to the more flexible alpha-helical arrangement.

Understanding how protein structure shapes material properties helps explain this. Alpha keratin is built from alpha-helical, coiled-coil regions that allow the chains to slide past each other a bit and bend without breaking, giving hair, skin, and nails their flexible, softer feel. Beta keratin, by contrast, forms tightly packed beta-pleated sheets that stack into stiff, rigid fibers, which makes structures composed of it much harder and less pliable.

Because of this difference, alpha keratin is softer than beta keratin. The other options don’t fit as well: beta keratin’s rigidity wouldn’t be described as softer, and while elasticity or brittleness relate to structure, the clearest contrast here is softness due to the more flexible alpha-helical arrangement.

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