The plasma membrane

A) separates the nucleus from the rest of the cell.
B) is a rigid protein membrane.
C) is not permeable.
D) has a single layer of phospholipids.
E) regulates movement of materials into and out of the cell.

Plasma Membrane

The lipid bilayer that forms the outer boundary of a cell, regulating the passage of substances in and out of the cell.

Phospholipids

Phospholipids are a class of lipids that are a major component of all cell membranes as they can form lipid bilayers.