Many organisms survive in environments of varying temperature. Fish, for example

Question

Many organisms survive in environments of varying temperature. Fish, for example, live in water that may change its temperature a great deal between summer and winter, or between the surface and at depth. Which of the following changes in the composition of the plasmalemma would be most useful for an organism moving into colder environments?
Answer

increase the fraction of saturated fatty acids in the membrane lipids

replace phosphatidyl choline in the membrane with phosphatidyl ethanolamine.

add cholesterol to the membrane

increase the fraction of unsaturated fatty acids in the membrane lipids

none of the above would be particularly effective.

Explanation / Answer

increase in the fraction of saturated fatty acids in teh membrame lipids

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