Which of the following organisms has the highest proportion of unsaturated fatty acids in their membrane?
A
Cactus
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B
Human
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C
Antarctic fish
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D
Bacteria from thermal hot springs
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Solution
The correct option is C Antarctic fish Antarctic fish as they need the unsaturated fatty acid chains in order to lower the critical temperature for the transition from a liquid crystal (fluid) to a gel phase (rigid) below the temperature in the antarctic.