Which best describes ONE secondary feature of a protein?
A) A single alpha helix in a polypeptide chain that has 2alpha helices and a beta pleated sheet
B)The two alpha helices in a polypeptide chain that has 2alpha helices and a beta pleated sheet
C)The overall shape of a single polypeptide chain that has 2aplpha helices and a beta pleated sheet
D)The overall shape of a single polypeptide chain in a proteinthat consists of two polypeptide chains