Question:
From the options given below choose the weakest bonds in biological systems.
From the options given below choose the weakest bonds in biological systems.
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Keep this general hierarchy of bond strength in biological (aqueous) environments memorized: Covalent (strongest) $>$ Ionic $>$ Hydrogen $>$ Hydrophobic $>$ Van der Waals (weakest).
Updated On: Jul 31, 2026
- Ionic bonds
- Hydrogen bonds
- Hydrophobic bonds
- Vander Waals bonds
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The Correct Option is D
Solution and Explanation
Step 1: Concept:
The question requires ordering various types of chemical interactions based on their relative bond strengths and identifying the weakest interaction among the given options, specifically in the context of aqueous biological systems.
Step 2: Step-by-step Explanation:
• Biological macromolecules rely on a variety of chemical bonds to maintain their complex three-dimensional structures. We evaluate them from strongest to weakest:
• Covalent bonds (not listed) are the strongest, involving the actual sharing of electron pairs between atoms (e.g., peptide bonds).
• Ionic bonds occur due to electrostatic attraction between fully charged opposite ions (e.g., Na\(^+\) and Cl\(^-\)). While water weakens them significantly compared to a dry salt crystal, they still remain relatively strong biological interactions.
• Hydrogen bonds involve the electrostatic attraction between a hydrogen atom covalently bonded to a highly electronegative atom (like Oxygen or Nitrogen) and another nearby electronegative atom. They provide crucial, moderate-strength stability to structures like the DNA double helix and protein alpha-helices.
• Hydrophobic bonds (interactions) are not true bonds, but thermodynamic forces that dictate the folding of proteins as non-polar molecules aggregate closely to minimize their contact with water. This driving force is quite significant.
• Van der Waals bonds (forces) are extremely weak, highly distance-dependent, transient electrostatic attractions. They arise from temporary, rapidly fluctuating dipoles in the electron clouds around atoms. They only become significant when molecules are exceptionally close together.
• Because Van der Waals forces possess the absolute lowest bond energy (usually roughly 0.4 to 4 kJ/mol) compared to all the others, they are definitively the weakest.
Step 3: Final Answer:
Van der Waals bonds are the weakest.
The question requires ordering various types of chemical interactions based on their relative bond strengths and identifying the weakest interaction among the given options, specifically in the context of aqueous biological systems.
Step 2: Step-by-step Explanation:
• Biological macromolecules rely on a variety of chemical bonds to maintain their complex three-dimensional structures. We evaluate them from strongest to weakest:
• Covalent bonds (not listed) are the strongest, involving the actual sharing of electron pairs between atoms (e.g., peptide bonds).
• Ionic bonds occur due to electrostatic attraction between fully charged opposite ions (e.g., Na\(^+\) and Cl\(^-\)). While water weakens them significantly compared to a dry salt crystal, they still remain relatively strong biological interactions.
• Hydrogen bonds involve the electrostatic attraction between a hydrogen atom covalently bonded to a highly electronegative atom (like Oxygen or Nitrogen) and another nearby electronegative atom. They provide crucial, moderate-strength stability to structures like the DNA double helix and protein alpha-helices.
• Hydrophobic bonds (interactions) are not true bonds, but thermodynamic forces that dictate the folding of proteins as non-polar molecules aggregate closely to minimize their contact with water. This driving force is quite significant.
• Van der Waals bonds (forces) are extremely weak, highly distance-dependent, transient electrostatic attractions. They arise from temporary, rapidly fluctuating dipoles in the electron clouds around atoms. They only become significant when molecules are exceptionally close together.
• Because Van der Waals forces possess the absolute lowest bond energy (usually roughly 0.4 to 4 kJ/mol) compared to all the others, they are definitively the weakest.
Step 3: Final Answer:
Van der Waals bonds are the weakest.
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