How does the orientation of hydrogen bonds in alpha helices differ from that in beta sheets?

• A. In alpha helices, hydrogen bonds are perpendicular to the axis, while in beta sheets, they are parallel.
• B. Both structures have hydrogen bonds parallel to their respective axes.
• C. In alpha helices, hydrogen bonds are parallel to the axis, while in beta sheets, they are perpendicular.
• D. Both structures have hydrogen bonds perpendicular to their respective axes.

Answer: (C)