The Dimensions of An $\alpha$ Helix from a Fibrous Protein Such as Keratin Differ Slightly

question 18

Multiple Choice

The dimensions of an $\alpha$ helix from a fibrous protein such as keratin differ slightly from an $\alpha$ helix from a globular protein. What is the reason for this difference in helical dimensions?

• A) An \(\alpha\) helix from a fibrous protein is left-handed, not right-handed.
• B) An \(\alpha\) helix from a fibrous protein contains mainly hydrophobic residues, elongating the helix.
• C) An \(\alpha\) helix from a fibrous protein contains mainly polar residues, elongating the helix.
• D) An\(\alpha\) helix from a fibrous protein forms a coiled-coil, distorting the helix.
• E) An \(\alpha\) helix from a fibrous protein contains mainly Gly residues for more efficient packing.

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