Which structure below indicates the proper hydrogen-bonding pattern between amino acids in an α-helix? (Dashed lines represent the hydrogen bonds. )
A)I
B)II
C)III
D)IV

Question

Which structure below indicates the proper hydrogen-bonding pattern between amino acids in an α-helix? (Dashed lines represent the hydrogen bonds. ) 
A)I 
B)II 
C)III 
D)IV

Quizplus · Accepted Answer

In an α-helix, the carbonyl group of an amino acid residue forms a hydrogen bond with the amide group of the amino acid residue four positions ahead of it. This pattern is represented by option II in the given structure, where the hydrogen bonds are correctly aligned in the same diagonal direction. Options I, III, and IV have incorrect hydrogen-bonding patterns.

Which Structure Below Indicates the Proper Hydrogen-Bonding Pattern Between Amino