The best and most correct answer among the choices provided by your question is the second choice or letter B "The lipids and proteins that make up the membrane allow it to be selective about what enters and leaves the cell."
Phospholipids form the basic structure<span> of a </span>cell membrane<span>, called the lipid bilayer. Scattered in the lipid bilayer are cholesterol molecules, which help to keep the </span>membrane <span>fluid consistent. </span>Membrane<span> proteins are important for transporting substances across the </span>cell membrane<span>.</span>
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