Logo
Jeeify
MCQEasyJEE 2023Proteins (Amino Acids, Structure, Denaturation)

JEE Chemistry 2023 Question with Solution

The one that does not stabilize 2∘2^\circ and 3∘3^\circ structures of proteins is:

  • A

    H-bonding

  • B

    −S−S−-\text{S}-\text{S}- linkage

  • C

    van der Waals forces

  • D

    −O−O−-\text{O}-\text{O}- linkage

Answer

Correct answer:D

Step-by-step solution

Standard Method

Given: The question asks which interaction does not stabilize the 2∘2^\circ and 3∘3^\circ structures of proteins.

Find: The correct option.

Proteins are stabilized by several interactions:

  • Hydrogen bonds stabilize structures such as alpha helices and beta sheets.
  • Disulfide linkages (−S−S−)(-\text{S}-\text{S}-) provide covalent stabilization.
  • van der Waals forces help maintain folded structure.
  • Electrostatic forces of attraction also contribute to stabilization.

Exclusion: Peroxide linkages (−O−O−)(-\text{O}-\text{O}-) are not involved in stabilizing protein secondary or tertiary structures.

Therefore, the one that does not stabilize protein 2∘2^\circ and 3∘3^\circ structures is −O−O−-\text{O}-\text{O}- linkage. The correct option is D.

The solution lists option A, but its own explanation identifies peroxide linkage (−O−O−)(-\text{O}-\text{O}-), which matches option D. Hence the resolved answer is D.

Common mistakes

  • Confusing disulfide linkage (−S−S−)(-\text{S}-\text{S}-) with peroxide linkage (−O−O−)(-\text{O}-\text{O}-). Disulfide bonds are well-known stabilizing covalent links in proteins, whereas peroxide linkages are not involved. Check the atoms in the linkage carefully.

  • Assuming only secondary structure is being asked. The question mentions both 2∘2^\circ and 3∘3^\circ structures, so interactions like hydrogen bonding, van der Waals forces, and disulfide bonds must all be considered before eliminating the wrong one.

  • Relying on the mislabeled option letter in the solution heading. The explanatory text is the reliable part here; it clearly states that peroxide linkage does not stabilize proteins. Match the concept back to the listed options before choosing.

Practice more Proteins (Amino Acids, Structure, Denaturation) questions

Get unlimited AI-adaptive practice, mastery tracking, and an AI tutor that explains every step — free to start.

Start free trialMore on Proteins (Amino Acids, Structure, Denaturation)

Related questions