Question

define cell membranes​

Answer 1

Answer:

The cell membrane, also known as the plasma membrane, is a double layer of lipids and proteins that surrounds a cell and separates the cytoplasm (the contents of the cell) from its surrounding environment. It is selectively permeable, which means that it only lets certain molecules enter and exit. It can also control the amount of some substances that go into or out of the cell. All cells have a cell membrane.

Explanation:

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Answer 2

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$\leadsto$ Cell Membrane : Cell membrane or plasma membrane is actually outer covering of the cell which seperates the contents of cell from outside. It is called semi-permeable because it permits entry and exit of some materials in and out of cell while prevents the movement of some other.