Phospholipids
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State
A phospholipid has two fatty acid chains and a phosphate-containing head, giving it a water-attracting head and two water-repelling tails.
Show
In water, phospholipids spontaneously arrange into a double layer, heads facing water on both sides and tails facing each other in the middle.
Watch for
A phospholipid's dual nature, one water-attracting end and one water-repelling end, drives that arrangement, not any active process.