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BIO NMDCAT Biological Importance of Water
nmdcat.online June 27, 2026

The role of water in maintaining the structure of the lipid bilayer is best described as a

A. Passive background solvent that merely fills the space
B. Dynamic participant that interacts with and stabilizes the polar head groups while driving non-polar tails together
✓
C. Chemical cross-linker that joins the fatty acid tails via ester bonds
D. Source of the cholesterol molecules that modulate membrane fluidity

📝 Explanation

Water plays a dual, active role: it forms hydrogen bonds with the phosphate head groups (hydration), stabilizing them, and it exerts the hydrophobic effect, forcing the fatty acid tails to aggregate to minimize their exposure to the aqueous phase.

📖 Additional Information

  • Passive background solvent that merely fills the space
  • Dynamic participant that interacts with and stabilizes the polar head groups while driving non-polar tails together
  • Chemical cross-linker that joins the fatty acid tails via ester bonds
  • Source of the cholesterol molecules that modulate membrane fluidity

Water plays a dual, active role: it forms hydrogen bonds with the phosphate head groups (hydration), stabilizing them, and it exerts the hydrophobic effect, forcing the fatty acid tails to aggregate to minimize their exposure to the aqueous phase.

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