FTP, name this structure, whose alpha variety is a basic structural component of proteins.
The Kyte-Doolittle scale is useful in predicting one kind of them, while the Davydov-Scott model examines the propagations of solitons along one type of them.  The antifreeze family contains the cold-resistant beta variety, while fumarase C and lipoxygenase contain the pi variety.  Turns of 120 degrees and i-i+3 ("i to i plus three") bonding define the more common 310 ("3 10") variety.  The most common variety can form coiled coils, leucine zippers, and other protein structures.  FTP, name this structure, whose alpha variety is a basic structural component of proteins.
The Kyte-Doolittle scale is useful in predicting one kind of them, while the Davydov-Scott model examines the propagations of solitons along one type of them.  
helices (accept "alpha helices" up until "cold-resistant")