medium · MCAT chem-phys
How does the addition of cholesterol to a biological membrane affect its fluidity at different temperatures?
- It increases fluidity at all temperatures by disrupting the packing of the phospholipid bilayer's fatty tails.
- It decreases fluidity at all temperatures by wedging between phospholipids, making the membrane uniformly rigid.
- It acts as a buffer, preventing excessive fluidity at high temperatures and maintaining fluidity at low temperatures.
- It has no effect on membrane fluidity whatsoever; it only serves as a biosynthetic precursor molecule for steroid hormones.
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