Why do phospholipids form a bilayer in water?
The phosphate portions repel each other.
The hydrophilic and hydrophobic parts attract each other.
The phosphate portions attract water, and the lipid portions repel water.
The lipid portions attract water, and the phosphate portions repel water.
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The correct answer is: The phosphate portion attracts water, and the lipid portions repel water.
Explanation:
- Phospholipid is composed of :
- a phosphate group attached with a phosphate ester bond to a glycerol molecule on one end.
- two fatty acid chains attached by an ester bond to the other end of the glycerol molecule.
- The phosphate group is hydrophilic (attracts water) in nature while the fatty acid chains are hydrophobic (repels water) in nature.
- By forming a bilayer in water, the phosphate groups remain exposed to the water, on the surface of the bilayer, while the fatty acid chains remain away from water, embedded within the bilayer.
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