Biologically, it plays key roles in maintaining the integrity of lipid bilayer membranes.
Correct answer: B. Hydrophobic
- A. Hydrophilic exclusion
- B. Hydrophobic
- C. Specific heat capacity exclusion
- D. Heat of vaporization
Explanation
Biologically, the hydrophobic interactions (Option B) play key roles in maintaining the integrity of lipid bilayer membranes. Lipid bilayers, such as the cell membrane, consist of hydrophilic (water-attracting) head groups and hydrophobic (water-repelling) tails. The hydrophobic interactions between the hydrophobic tails of lipid molecules help to stabilize the bilayer structure and keep the hydrophilic head groups facing the aqueous environment, which is essential for the proper functioning of cell membranes.
This question appeared on the UHS MDCAT 2023 paper, which you can sit online with every answer explained.
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About Biological Importance of Water
Water supports life through its polarity, hydrogen bonding and ability to dissolve ionic and polar substances. Its high specific heat, heat of vaporization, cohesion, adhesion and incompressibility help regulate temperature, transport materials and maintain structure, while hydrolysis and osmosis depend directly on water.
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