Formation of a lipid bilayer might seem to be energetically unfavorable. However...

    

    Formation of a lipid bilayer might seem to be energetically unfavorable. However, this arrangement is actually favored because it allows a higher level of entropy than any other alternative. What makes bilayer formation energetically favorable?

    Answer
       A.    
    Water molecules form cage-like structures around hydrophobic molecules.
       B.    
     Fatty acid tails are highly saturated and flexible.
       C.    
     Polar head groups form a hydrogen bonding network at the interface with water.
       D.    
    Hydrogen bonds form between neighboring polar head groups in the bilayer.
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