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<p>by proteins embedded in the membrane.</p>

<p><big> Biological membranes </big></p>
<p><big> Phospholipid bilayer </big></p>
<p>A phospholipid bilayer is an example of a biological semipermeable membrane. It consists of two parallel, opposite-facing layers of uniformly arranged <a href="page.php?w=phospholipid">phospholipid</a>s. Each phospholipid is made of one <a href="page.php?w=phosphate">phosphate</a> head and two <a href="page.php?w=fatty_acid">fatty acid</a> tails. The <a href="page.php?w=Cell_membrane">plasma membrane</a> that surrounds all biological</p><p>
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