What is the answer to this 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
A)increase the fraction of saturated fatty acids in the membrane lipids
B) replace phosphatidyl choline in the membrane with phosphatidyl ethanolamine.
C) increase the fraction of unsaturated fatty acids in the membrane lipids
D) add cholesterol to the membrane
E) none of the above would be particularly effective.