Question

the a - helix is a component of ____________ protein structure. view available hint(s) primary tertiary quinary quaternary secondary

Explanation:

Protein structure has four levels. The α - helix is formed by hydrogen - bonding between backbone atoms, which is a characteristic of secondary structure. Primary structure is the amino - acid sequence, tertiary is the 3 - D folding of a single polypeptide, quaternary is the arrangement of multiple polypeptide subunits, and there is no quinary level in standard protein structure hierarchy.

Answer:

E. secondary