| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | cell membrane | Europe | The cell membrane is a key focus of study in biology and is considered essential for the functioning of cells. | 1 |
| 2 | cell membrane outer surface | Europe | The outer surface of the cell membrane is a critical barrier that regulates the movement of substances into and out of the cell. | 1 |
| 3 | cell membrane surface | Europe | The cell membrane surface is often depicted as a fluid mosaic model, with proteins and lipids floating in a fluid bilayer. | 1 |