Discussion
Assertion (A): Cholesterol both increases and decreases membrane fluidity depending on conditions.
Reason (R): It restricts phospholipid movement when warm and prevents close packing when cold.
Answer: C
Both statements are true and the reason resolves the apparent contradiction: the same molecule has opposite effects at the two temperature extremes, which is exactly what buffering means. The membrane therefore stays workable over a range no pure bilayer could manage.
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