Why are lipids and proteins free to move laterally in membranes?
A) The interior of the membrane is filled with liquid water.
B) Lipids and proteins repulse each other in the membrane.
C) Hydrophilic portions of the lipids are in the interior of the membrane.
D) There are only weak hydrophobic interactions in the interior of the membrane.
E) Molecules such as cellulose can pull them in various directions.

Question

Quizplus · Accepted Answer

The interior of the membrane is largely composed of hydrophobic tails of the phospholipids. This results in weak hydrophobic interactions which allow for free lateral movement of lipids and proteins. The hydrophilic heads of the phospholipids face the aqueous environment both inside and outside of the cell membrane.

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