JEE Main 2026 · 5 Apr · Shift 2 · Chemistry Q68

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ChemistrySingle correct+4 / -1Question 68 of 75

Identify the incorrect statement about tertiary structure of proteins.

They can be fibrous or globular in structure.

The main forces that stabilize the structure are hydrogen bonding, disulphide links, van der Waals and electrostatic forces of attraction.

The structure remains intact when exposed to pH changes.

A linear polypeptide chain will convert to a secondary structure and then further folding of the secondary structure will convert to tertiary structure.

Answer and worked solution

Official answer: C

Each option.

(A): Proteins can be fibrous or globular. True.
(B): Tertiary structure is held by hydrogen bonds, disulphide links, van der Waals and electrostatic forces. True.
(D): The chain folds into secondary structure, then folds further into tertiary structure. True.
(C): pH changes disrupt these interactions and denature the protein. So the structure does not remain intact: this is the incorrect statement.

(C)

Topics:Amino acids and proteins

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JEE Main 2026 · 5 Apr · Shift 2, Chemistry question 68