When a globular protein is subjected to thermal denaturation by boiling, which level of protein structural organization remains intact?
Answer and explanation
Correct answer: B. Primary structure
- Step 1: Denaturation disrupts weaker non-covalent interactions (hydrogen bonds, ionic bonds, hydrophobic forces) that maintain higher-order folding.
- Step 2: The strong covalent peptide bonds linking the amino acid sequence are not hydrolyzed by moderate heating.
- Step 3: Consequently, the primary structure remains completely intact.
Answer
Primary structure.
Why not the others: Secondary, tertiary, and quaternary folded architectures are unfolded and destroyed during thermal denaturation.
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