An alpha-helix is a type of secondary structure in a peptide chain.

the verdict

SUPPORTED

the evidence backs this

Recorded sources

7 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that an alpha-helix is a type of secondary structure in a peptide chain?

Yes. An alpha-helix is widely documented in scientific literature and reference works as a fundamental type of secondary structure found in peptide and protein chains.

Verdict: SUPPORTED · 7 sources for, 0 against · Last checked 4 Oct 2026

How claims like this are judged

Judged against reference works: claims of this kind are settled by reference works, not journal abstracts.

Evidence for · 7

Wikipedia: Alpha helix

Reference article covering this claim directly

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Wikipedia: Alpha helix. (n.d.). Wikipedia. https://en.wikipedia.org/wiki/Alpha_helix

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More for · 6

PLOS (all journals): Bioinformatics design of peptide binding to the human cardiac troponin I (cTnI) in biosensor development for myocardial infarction diagnosis

Refers to alpha-helix structures formed by amino acids within a peptide/protein.

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PLOS (all journals): Bioinformatics design of peptide binding to the human cardiac troponin I (cTnI) in biosensor development for myocardial infarction diagnosis. (n.d.). PLOS (all journals). https://doi.org/10.1371/journal.pone.0305770

arXiv: arXiv: Discrete breathers in protein secondary structure

Identifies the alpha-helix as a type of protein secondary structure in a peptide chain.

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arXiv: arXiv: Discrete breathers in protein secondary structure. (n.d.). arXiv. https://arxiv.org/abs/cond-mat/0306135

GovInfo: FR 2021 05 26

Lists the alpha-helix as a secondary structure of helices.

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GovInfo: FR 2021 05 26. (n.d.). GovInfo. https://www.govinfo.gov/app/details/FR-2021-05-26

LibreTexts: LibreTexts: Solutions for Sample Midterm 2

Identifies the alpha-helix as a secondary structure commonly found in globular proteins.

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LibreTexts: LibreTexts: Solutions for Sample Midterm 2. (n.d.). LibreTexts. https://bio.libretexts.org/Courses/University_of_California_Davis/BIS_102%3A_Structure_and_Function_of_Biomolecules_(Gasser)/Reader/Chapter_4/Solutions_for_Sample_Midterm_2

National Library of Medicine MeSH: MeSH: Protein Conformation, alpha-Helical

Defines the alpha-helix as a secondary structure of proteins.

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National Library of Medicine MeSH: MeSH: Protein Conformation, alpha-Helical. (n.d.). National Library of Medicine MeSH. https://meshb.nlm.nih.gov/record/ui?ui=D000072756

OpenStax: OpenStax Biology 2e: 3.4 Proteins

States that local folding of a polypeptide gives rise to secondary structures, with the alpha-helix being a primary example.

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OpenStax: OpenStax Biology 2e: 3.4 Proteins. (n.d.). OpenStax. https://openstax.org/books/biology-2e/pages/211c8917-4044-4b0e-980c-0a84a86a48b0@

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