Which of the following statements is incorrect? (a) In \( \alpha \)...

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Which of the following statements is incorrect?
(a) In \( \alpha \)-helix structure a polypeptide chain forms all possible hydrogen bonds by twisting into a right handed screw.
(b) In \( \beta \)-structure of proteins all peptide chains are stretched out to nearly maximum extension.
(c) During denaturation \( 1^{\circ} \) and \( 2^{\circ} \) structures are destroyed but \( 3^{\circ} \) structure remains intact.
- (d) All the above statements are incorrect.
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