Which Level of Organization is Represented by an α-Helix or β-Pleated

Question

Which level of organization is represented by an α-helix or β-pleated sheet?
A)Secondary
B)Primary
C)Tertiary
D)Quarternary

Accepted Answer

The α-helix and β-pleated sheet are examples of secondary structures in proteins, which are formed by hydrogen bonds between the backbone atoms in the polypeptide chain.