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Multiple Choice

Denatured proteins lose

Denaturation disrupts the noncovalent interactions that stabilize a protein’s folded form, so the secondary structures (like alpha helices and beta sheets) unravel and the overall three-dimensional fold (the tertiary structure) is lost. The primary sequence, held together by covalent peptide bonds, remains intact under typical denaturing conditions, which is why the backbone sequence doesn’t disappear. If there are multiple subunits, their association can also fall apart, but the key outcome is the loss of secondary and tertiary structure while the amino acid sequence stays the same.

Denaturation disrupts the noncovalent interactions that stabilize a protein’s folded form, so the secondary structures (like alpha helices and beta sheets) unravel and the overall three-dimensional fold (the tertiary structure) is lost. The primary sequence, held together by covalent peptide bonds, remains intact under typical denaturing conditions, which is why the backbone sequence doesn’t disappear. If there are multiple subunits, their association can also fall apart, but the key outcome is the loss of secondary and tertiary structure while the amino acid sequence stays the same.