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- DictionaryCell mem·brane
noun
- 1. the semipermeable membrane surrounding the cytoplasm of a cell.
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noun
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Biological membrane that separates the interior of a cell from its outside environment
The cell membrane is a biological membrane that separates and protects the interior of a cell from the outside environment. The cell membrane consists of a lipid bilayer, made up of two layers of phospholipids with cholesterols (a lipid component) interspersed between them, maintaining appropriate membrane fluidity at various temperatures. The membrane also contains membrane proteins, including in... Wikipedia