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Plasma Membrane
The biological membrane that separates the interior of all cells from the outside environment, protecting the cell and controlling movement of substances in and out.
Hydrophobic Region
A part of a molecule that is repelled by water and tends to be nonpolar.
Phospholipids
A class of lipids that are a major component of all cell membranes, essential for cellular function.
Polar (Hydrophilic) Region
A part of a molecule that has a tendency to interact with water through hydrogen bonding or electrostatic interaction, making it soluble in water.