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Enzymes, which are proteins, lose activity when their tertiary structure is disrupted (denatured), as the active site is altered.
Ref: NCERT Class 12 Chemistry > Chapter 14: Biomolecules > Topic: Proteins - Structure, Classification and Denaturation
Disulfide bonds between cysteine residues help stabilize the tertiary structure of proteins.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Enzyme Action and Factors Affecting Enzyme Activity
Circular dichroism interpretation relies on spectral region. Far-ultraviolet region from 190 to 250 nanometers dominated by backbone amide transitions provides secondary structure information on helices and sheets. Near-ultraviolet region from 250 to 320 nanometers originates from aromatic residues of tryptophan, tyrosine, phenylalanine and disulfides held rigidly in chiral tertiary environment, offering tertiary structure information. Tryptophan emission reports solvent polarity via fluorescence, not dichroism. Beta-sheet twist influences far-ultraviolet shape. Near-ultraviolet CD thus correctly pairs with tertiary structure assessment in folding studies.
Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.
Disulfide bonds accurately describes the structural composition or molecular organization asked about in this question. In Amino Acids Basics, knowledge of molecular structure is directly linked to understanding biological function. The specific arrangement of chemical components in Disulfide bonds determines its physical properties, biological activity, and interactions with other molecules. The other options (Peptide bonds, Hydrogen bonds, and Ionic bonds) describe different structural arrangements, incorrect stoichiometry, or compositions of different biological molecules.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 3
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