why do unsaturated fatty acids help keep any membrane more fluid at lower temperatures?

Question

A. unsatturated fatty acids have a higher chlestrol content
B. unsatturated fatty acids permit more water in the interior of the membrane
C. the double bonds result in a shorter fatty acid tail
D. the double bonds block interaction among the hydrophilic head of the lipids
E. the double bonds form a kink in the fatty acid tail, forcing adjacent lipids to be further apart

Answer 1

Well, E is the only answer that isn't wrong.

But in truth, it has more to do with the kinked fatty acids preventing the close packing of the non-polar regions of the fatty acids, and the ends of these tails being involved in more collisions with other fatty acids as they rotate and laterally diffuse through the membrane, "stirring" things up.

Answer 2

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RE:
why do unsaturated fatty acids help keep any membrane more fluid at lower temperatures?
A. unsatturated fatty acids have a higher chlestrol content
B. unsatturated fatty acids permit more water in the interior of the membrane
C. the double bonds result in a shorter fatty acid tail
D. the double bonds block interaction among the hydrophilic head of the lipids
E. the double bonds...

Answer 3

E is the answer

http://telstar.ote.cmu.edu/Hughes/tutorial/cellmembranes/