A) A supersecondary region, often shared by proteins, that has a specific function.
B) A repetitive supersecondary structure.
C) A double-layered arrangement formed so that the polar groups face the aqueous environment, while the nonpolar regions are kept away from the aqueous environment.
D) An unfolded region of a protein.

A) primary structure
B) secondary structure
C) tertiary structure
D) quaternary structure
E) All of these

A) primary structure
B) secondary structure
C) tertiary structure
D) quaternary structure
E) All of these