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State whether the following is true or false.
Increasing the proportion of unsaturated fatty acids makes a membrane less fluid.

  • A.True only at large scales
  • B.False only at small scales
  • C.True
  • D.False

Answer: D

The kinks introduced by double bonds stop the tails packing closely, so fluidity rises rather than falls rather than dropping. Organisms living in the cold accordingly build membranes with a higher proportion of unsaturated lipid, keeping them workable at low temperature.

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