Multiple Choice
In an \( \alpha \)-helix, which type of interaction primarily stabilizes the helical structure?
4. Protein Structure
Alpha Helix
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Which secondary structure of proteins is characterized by a spiral (helical) shape?
A
Random coil
B
Alpha helix
C
Beta turn
D
Beta sheet
Verified step by step guidance1
Understand the concept of secondary structures in proteins: Secondary structures refer to the local folding patterns of the polypeptide chain stabilized by hydrogen bonds. Common types include alpha helices, beta sheets, beta turns, and random coils.
Focus on the alpha helix: The alpha helix is a right-handed spiral structure stabilized by hydrogen bonds between the carbonyl oxygen of one amino acid and the amide hydrogen of another amino acid four residues away.
Compare the alpha helix to other secondary structures: Beta sheets consist of extended strands connected by hydrogen bonds, beta turns allow the polypeptide chain to reverse direction, and random coils lack a defined structure.
Recognize the defining feature of the alpha helix: Its spiral (helical) shape is a key characteristic that distinguishes it from other secondary structures.
Conclude that the secondary structure characterized by a spiral (helical) shape is the alpha helix.
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