AP Biology Quiz
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The plasma membrane is a phospholipid bilayer with embedded proteins. The bilayer's hydrophobic interior limits diffusion of polar solutes, while specific transport proteins can facilitate passage. A researcher inserts additional cholesterol molecules between phospholipid tails in a membrane at moderate temperature. The membrane becomes less fluid and shows reduced diffusion of a small nonpolar solute, with no change in transport protein number.
Which feature best explains the reduced diffusion of the nonpolar solute?
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