What makes phospholipid membranes good at keeping some molecules out, and allowing others to freely pass?

What makes phospholipid membranes good at keeping some molecules out, and allowing others to freely pass? 



A. They are positive charged.
B. They have both hydrophilic and hydrophobic regions.
C. They are completely hydrophilic.
D. They are completely hydrophobic.


Answer: B. They have both hydrophilic and hydrophobic regions.


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