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Why are cell membranes composed of two phospholipid layers, with the fatty acid tails of each layer directly interacting with each other?

Why are cell membranes composed of two phospholipid layers, with the fatty acid tails-example-1
User Noriyuki
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Answer:

I think it is "The fatty acid tails are hydrophilic, and the negative charges on one set of tails ate attracted to the positive charges on the other set of tails

User Frank Yellin
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