Which term describes the secondary structure of a protein?

The secondary structure of a protein refers specifically to the local folded structures that form within a protein due to interactions between the backbone atoms in the polypeptide chain. The most commonly recognized types of secondary structures are the alpha helices and beta pleated sheets, which arise from hydrogen bonding between amino acid residues. These hydrogen bonds stabilize the segments of the polypeptide chain and contribute to its overall fold and thus play a crucial role in the protein's shape and function.

By stating that hydrogen bonds form beta pleated sheets and alpha helices, this answer accurately captures the essence of what secondary structure is in the context of protein architecture. It highlights the specific structural motifs formed through intramolecular interactions, which are pivotal in determining the protein's higher-level conformation and functionality.