Discussion
Cholesterol in an animal cell membrane acts to
Answer: B
Correct answer: moderate fluidity across a range of temperatures
Cholesterol is a buffer against temperature in both directions. At warm temperatures its rigid ring system restrains the movement of the fatty acid tails and reduces fluidity; at cold temperatures it wedges between them and prevents the close packing that would otherwise gel the membrane. The result is that the membrane stays workable over a far wider range than it would alone.
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