Question

What is a cell membrane?​

Answer 1

The cell-membrane or plasma membrane surrounds nucleus and cytoplasm in all types of cells. However in bacteria and plants,plasma membrane itself is surrounded by a cell-wall.It can repair itself to some extent.Different models have been presented to understand the structure of cell membrane.

Step-by-step explanation:

Answer 2

The cell membrane is a thin semi-permeable membrane that surrounds the cytoplasm of a cell. Its function is to protect the integrity of the interior of the cell by allowing certain substances into the cell while keeping other substances out.