Which of the Following is True About Phospholipid Bilayers

Question

Which of the following is true about phospholipid bilayers?  
A) The hydrophobic head faces the cell exterior.
B) The polar heads face the cell interior and exterior.
C) The hydrophobic tail faces the cell interior.
D) The polar tails face the cell interior and exterior.
E) The interior of the layer is highly hydrophilic.

Accepted Answer

Phospholipid bilayers have polar (hydrophilic) heads that face both the cell exterior and interior, interacting with the aqueous environments on either side, while the hydrophobic tails are oriented towards each other in the interior of the bilayer, away from water.