The relationship between amino acid sequences and protein secondary structures like alpha-helices and beta-sheets is a fundamental, well-established principle of biochemistry and does not require citation.
The claim states a foundational biochemical fact: protein primary sequences (amino acid composition and order) determine and predict secondary structures such as alpha-helices and beta-sheets (established by Anfinsen's dogma and decades of protein biophysics). Per the system instructions, a claim that is trivially true by definition or direct everyday observation/basic scientific consensus is classified as COMMON_KNOWLEDGE, requiring no citations.