Final answer:
Cholesterol increases cell membrane fluidity at lower temperatures and prevents excessive fluidity at higher temperatures, functioning as a buffer. The presence of more unsaturated fatty acids also contributes to a more fluid membrane.
Step-by-step explanation:
The statement that an elevation in cholesterol content can increase cell membrane fluidity at lower temperatures is true. Cholesterol serves as a buffer in cell membranes, preventing the inhibition of fluidity at lower temperatures. While at higher temperatures, it prevents excessive fluidity. This means that cholesterol helps to maintain the membrane in a fluid state, which is essential for its proper functioning. Other factors that influence membrane fluidity include the saturation of fatty acids; membranes with more unsaturated fatty acids tend to be more fluid due to the kinks in their tails that create space, allowing for greater movement of the membrane components.