Asked in FBISE Biology 2022 — Paper 3 2022

The property of water which helps to maintain the integrity of the lipid bilayer is

Correct answer: D. Hydrophobic exclusion

  • A. High specific heat capacity
  • B. Hydrogen bonding
  • C. Cohesion and tension
  • D. Hydrophobic exclusion

Explanation

Hydrophobic exclusion cause water molecules to be repelled by the hydrophobic tails of phospholipids, causing them to cluster around the hydrophilic heads. This exclusion creates an environment where the hydrophobic tails are shielded from water, promoting the structural integrity of the lipid bilayer by preventing water from penetrating and disrupting its structure.

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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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