On denaturation a protein loses which structures?
ASecond and third
BFirst and third
CFirst and second
DFirst and fourth
Answer & Solution
Correct answer: A. Second and third
1. Heat or a pH change breaks the hydrogen bonds.
2. The helix uncoils and the globule unfolds.
3. Secondary and tertiary go, but primary survives.
_Source: NCERT Class 12 Chemistry Part 2, Unit 10 'Biomolecules'_
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