Question

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the plasma membrane is composed of a
, in which two layers of phospholipids are arranged tail-to-tail.
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Explanation:

The plasma membrane's structure involves a phospholipid bilayer. The term "phospholipid bilayer" describes the arrangement where two layers of phospholipids are oriented tail - to - tail, with the hydrophilic heads facing outward and hydrophobic tails inward, forming the basic structure of the plasma membrane.

Answer:

phospholipid bilayer