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Question

Name the structure of protein in which all peptide chains are stretched out to full extension and laid side by side through intermolecular hydrogen bonds.

A
α-helix
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B
β-pleated sheet
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C
tertiary structure
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D
None of the above
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Solution

The correct option is B β-pleated sheet
β-pleated sheet: In this structure, all peptide chains​ are stretched out to a nearly maximum extension and then laid side by side that are held together ​by intermolecular H-bond.​ The polypeptide chains can ​link together in parallel and ​antiparallel sequence. ​Thus option b is correct.

α-helix: In this structure, a polypeptide chain forms all possible H–bonds by twisting into a right-handed screw helix.​

Tertiary Structure of Proteins: It represents overall folding of​ the polypeptide chains i.e., further ​folding of the secondary structure producing a 3D structure. ​

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