Properties of water in biochemistry: Which listed statement does NOT correctly describe liquid water?

Introduction / Context:Water’s unique properties drive protein folding, membrane assembly, and acid–base chemistry in life. Distinguishing hydrophilic from hydrophobic effects is essential for understanding biomolecular structure.

Given Data / Assumptions:

• Liquid water near room temperature.
• Hydrogen bonding network among molecules.
• Hydrophobic interactions occur among nonpolar solutes in water.

Concept / Approach:Water is polar and forms extensive hydrogen bonds. Hydrophobic interactions are not bonds formed by water; rather, they are entropy-driven associations of nonpolar molecules that minimize disruption of water’s hydrogen-bonded network. Thus, saying “water readily forms hydrophobic interactions” is incorrect; water drives hydrophobes together but does not “form” those interactions itself.

Step-by-Step Solution:Recall geometry: bent, asymmetric; strong dipole.Recognize hydrogen-bond donors/acceptors: H (donor) and O lone pairs (acceptor).Identify the false statement: water forming hydrophobic interactions.

Verification / Alternative check:Consider oil droplets coalescing in water; the driving force is water’s preference to hydrogen bond with itself, excluding nonpolar surfaces.

Why Other Options Are Wrong:

• Asymmetry/polar bonds/dipole: All true.
• Hydrogen-bonding by all atoms: Oxygen accepts; hydrogens donate; net effect involves all three atoms.

Common Pitfalls:Equating “hydrophobic interaction” with a physical bond type; it is an emergent thermodynamic phenomenon.

Final Answer:Water readily forms hydrophobic interactions.