NEET 2026 Chemistry question

The correct statement about peptides and proteins is

(1)Tertiary structure of proteins has two or more polypeptide subunits
(2)Only the proteins having a quaternary structure are biologically active
(3)In -pleated sheet structures, peptide chains are held together by intermolecular hydrogen bondsCorrect
(4)In -helices, the polypeptide chain is twisted into a left-handed screw (helix) through intramolecular hydrogen bonds

Answer: (3)

Solution

(3) In the -pleated sheet, neighbouring polypeptide chains lie side by side and are held together by intermolecular hydrogen bonds between C=O and N-H groups - correct. (1) Two or more subunits characterise the quaternary

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Question ID VK-105036