The secondary order of protein structure is
Correct answer: B. The formation of hydrogen bonds leading to alpha-helices and beta-pleated sheets
- A. The sequence of amino acids in the polypeptide chain
- B. The formation of hydrogen bonds leading to alpha-helices and beta-pleated sheets
- C. The formation of peptide bonds between amino acids
- D. The folding of the coiled polypeptide chain into a three-dimensional shape
Explanation
The secondary structure of a protein refers to the regular local structures that form within a polypeptide due to hydrogen bonding. These include alpha-helices and beta-pleated sheets. Option C correctly identifies this structural level as the coiling of the polypeptide chain into these specific shapes.Option A is incorrect because it describes the primary structure, which is the linear sequence of amino acids. Option B is incorrect because peptide bonds form the primary structure by linking amino acids together. Option D is incorrect as it describes the tertiary structure, which involves the further folding of the secondary structures into a three-dimensional conformation.
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