NUTRITION
LIPIDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which has a higher permeability?
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Saturated hydrocarbon tails.
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Unsaturated hydrocarbon tails.
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Equal amounts of permeability.
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None of the above
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Explanation:
Detailed explanation-1: -A) Bilayers are most permeable and most fluid when they consist of longer, unsaturated hydrocarbon tails.
Detailed explanation-2: -Because there is more distance between the tails of unsaturated fatty acids, they in turn have fewer intermolecular interactions creating more membrane fluidity.
Detailed explanation-3: -If unsaturated fatty acids are compressed, the “kinks” in their tails push adjacent phospholipid molecules away, which helps maintain fluidity in the membrane. The ratio of saturated and unsaturated fatty acids determines the fluidity in the membrane at cold temperatures.
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