Final answer:
The α helix is a type of secondary structure in proteins, where the polypeptide chain folds into a spiraled shape stabilized by hydrogen bonds.
Step-by-step explanation:
The statement that is true regarding the α helix is: It is a type of secondary structure in proteins. The α helix structure is a form of secondary protein structure characterized by the polypeptide chain folding into a helix shape stabilized by hydrogen bonds. This helical pattern is critical in defining the protein's overall shape and function. The secondary structure is distinct from the primary structure, which is the linear sequence of amino acids, the tertiary structure, which involves the three-dimensional folding of a single polypeptide chain, and the quaternary structure, which is the combination of multiple polypeptide chains.