An alpha helix is a common structural motif in proteins, characterized by a right-handed coil or spiral. It is formed when the backbone of the protein folds in a specific way, allowing hydrogen bonds to form between the amino acids. This structure is stabilized by these bonds, which occur between every fourth amino acid, contributing to the overall stability of the protein. Alpha helices play a crucial role in the function of many proteins, influencing their shape and interactions. They are often found in enzymes, membrane proteins, and structural proteins, helping to determine how these molecules perform their biological roles.