What is the function of cholesterol in the cell membrane? A. To allow substances too pass through
B. To prevent the hydrophobic tails from sticking together
C. To make more room inside the cell membrane
D. To help the cell recognize self and non self

Cholesterol helps to restrict the passage of molecules by increasing the packing of phospholipids. Cholesterol can fit into spaces between phospholipids and prevent water-soluble molecules from diffusing across the membrane.

Explanation:

option a and d is the correct answer

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when the displaced particles are perpendicular to the direction the wave travels, is called a transverse wave, whereas in longitudinal wave the displace practices are parallel to the direction of the wave.

in the given image:

first image shows - longitudinal wave

second image shows - transverse wave

third image shows - longitudinal wave

fourth image shows - longitudinal wave