Membrane fluidity is determined by the composition of the fatty acids within the membrane. Unsaturated fatty acids increase membrane fluidity because the double bonds introduce kinks in the hydrocarbon tails, preventing them from packing tightly together. This allows for more movement and fluidity within the membrane. Therefore, as the percent of unsaturated fatty acids increases, membrane fluidity increases.

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Membrane Fluidity

Question 55

Multiple Choice

Membrane fluidity

A) increases as the percent of unsaturated fatty acids increases.
B) increases as the percent of unsaturated fatty acids decreases.
C) increases as the length of fatty acid side chains increases.
D) is independent of the nature of fatty acids.
E) increases as the percent of saturated fatty acids increases.

Correct Answer: