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CBSE Class 12 · 2006 · Delhi Compartment · BiomoleculesShort Answer

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i) Which forces are responsible for the stability of the α-helix?
ii) What is a denatured protein?

Solution

(i) The α-helix is pinned by \textbf{intramolecular hydrogen bonds} — each amide N–H to the carbonyl oxygen of the fourth residue along the coil.
(ii) A \textbf{denatured protein} has had its secondary and tertiary structure destroyed (helices uncoiled, globules unfolded) by heat or pH change, losing biological activity while the primary chain survives — boiled egg albumin.

CBSE Class 12 Board · 2006 · Delhi Compartment · Subjective

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