The alpha helix is a common structural motif in proteins, characterized by a right-handed coil or spiral. It is stabilized by hydrogen bonds between the backbone amide and carbonyl groups of the amino acids, typically every fourth residue. This structure plays a crucial role in the overall shape and function of proteins. Alpha helices are often found in various proteins, including enzymes and structural proteins, contributing to their stability and functionality. The presence of alpha helices can influence how proteins interact with other molecules, making them essential for biological processes.