Lipid bi-layer
The lipid bi-layer provides a basic impermeable barrier around cells, they are approximately 5nm thick. They help to maintain different environments between cytosol and the extracellular environment/organelles, and also control the transport of solutes between compartments.[1]
- ↑ Molecular Biology of the Cell, Alberts et al, 5th Edition (2007)Garland Science, New York Chapter 10 p617-65