Which of the following secondary structures is the most extended conformation?
β-Sheet is the scientifically accurate answer to this question. Within the study of Protein Structure, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of β-Sheet directly address what is being asked. Among the other options, α-Helix, 310 Helix, and π-Helix do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 4