Question

During denaturation, which level of protein structure remains unchanged?

• A. primary
• B. secondary
• C. tertiary
• D. quaternary

Hint:

Denaturation breaks hydrogen bonds and folding but not the peptide bonds of the primary structure.

Answer 1

The Correct Option is A

Step 1: Which bonds break
Weak interactions, such as hydrogen bonds, break easily.

Step 2: Which survive
Peptide bonds between amino acids are strong covalent bonds and survive.

Step 3: Answer
Primary structure, option (A).

Final Answer:
Option (A). \[ \boxed{\text{Primary}} \]