Target Exam

CUET

Subject

Chemistry

Chapter

Organic: Biomolecules

Question:

When a protein in its native form, is subjected to physical or chemical change, then its

Options:

The primary and secondary structures remain intact.

The secondary and tertiary structures remain intact.

Only the secondary structure remains intact.

Only the primary structure remains intact.

Correct Answer:

Only the primary structure remains intact.

Explanation:

The correct answer is Option (4) → Only the primary structure remains intact.

When a protein in its native form is subjected to physical or chemical change, denaturation occurs.

  • Denaturation does not break peptide (amide) bonds, so the primary structure remains intact.
  • Secondary, tertiary (and quaternary) structures are destroyed.