What are the functions of the outer cytoplasmic membrane?

The outer cytoplasmic membrane performs a number of functions:
1. Barrier. The outer cytoplasmic membrane separates the contents of the cell from the environment.
2. Transport. Active and passive transfer of substances to and from the cell goes through the cell membrane.
Z. Structural. The outer cell membrane in a multicellular organism provides contact between adjacent cells. It is an integral and organizing part of all cells.
4. The receptor. On the outer surface of the membrane are receptors of a glycoprotein nature.

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