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nmdcat.online June 27, 2026

The presence of a double bond in the “cis” configuration in an unsaturated fatty acid chain causes a rigid kink that has the effect of

A. Enhancing the tight packing of membrane phospholipids
B. Decreasing membrane fluidity at low temperatures
C. Increasing the fluidity of the membrane
✓
D. Creating covalent cross-links between adjacent lipid chains

📝 Explanation

The cis-double bond introduces a fixed bend in the hydrocarbon tail. This prevents the fatty acid chains from packing closely together, increasing the free volume within the bilayer and thereby increasing its fluidity and permeability compared to saturated chains.

📖 Additional Information

  • Enhancing the tight packing of membrane phospholipids
  • Decreasing membrane fluidity at low temperatures
  • Increasing the fluidity of the membrane
  • Creating covalent cross-links between adjacent lipid chains

The cis-double bond introduces a fixed bend in the hydrocarbon tail. This prevents the fatty acid chains from packing closely together, increasing the free volume within the bilayer and thereby increasing its fluidity and permeability compared to saturated chains.

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