Identify true statements of cholesterol and its fluidity.

1. cholesterol decreases membrane fluidity in areas called rafts, which contain large amounts of sphingolipids and cholesterol.
2. cholesterol inhibits crystallization that would otherwise occur in membranes rich in unsaturated fatty acids.
3. cholesterol is generally buried in a bilayer, with its planar rings oriented toward the solvent and its hydroxyl group aligned with the fatty acid tails of the bilayer.
4. cholesterol increases membrane fluidity that otherwise contains mostly long chain saturated fatty acids.

The correct answer is 2. Cholesterol inhibits crystallization that would otherwise occur in membranes rich in unsaturated fatty acid.

Explanation:

Cholesterol is a complex lipid and also an important constituent of plasma membrane.Cholesterol regulates the membrane fluidity in both high and low temperature.

    At high temperature cholesterol increases the melting point for stabilizing the membrane and in low temperature cholesterol interacts with adjacent phospholipids thus result to prevent crystallization.

it's filtration, but this is an assumption so my apologies if i got this