Chemical barriers composed of phospholipid bilayers form within biological systems because
A. the inability of the polar heads to dissolve in water causes the heads to adhere to one another.
B. hydrophobic exclusion results in the close positioning of the nonpolar tails.
C. van der Waals forces attract the polar heads to the water inside the cell.
D. cells expend ATP to position the phospholipid tails close together.
Answer: B
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