Question

which level of protein structure is formed by the weak bonds between oxygen and hydrogen atoms within the polypeptide backbone?
a) primary structure
b) quarternary structure
c) tertiary structure
d) secondary structure

Explanation:

• Primary structure is the amino acid sequence, no weak bonds between backbone atoms.
• Quaternary structure involves multiple polypeptide chains, not just backbone bonds.
• Tertiary structure is 3D folding from R - group interactions.
• Secondary structure (e.g., alpha - helices, beta - sheets) is formed by hydrogen bonds between oxygen (of carbonyl) and hydrogen (of amide) in the polypeptide backbone.

Answer:

d) Secondary structure