The most important property of the cell membrane is its selective permeability: some substances can pass through it freely, but others cannot. Small and non polar (hydrophobic) molecules can freely pass through the membrane, but charged ions and large molecules such as proteins and sugars are barred passage.
Particles like larger uncharged polar molecules such as glucose, charged molecules like ions, etc. cannot pass through the cell membrane.
The nature of the cell membrane is selectively permeable which allows the passage of some molecules very easily while restricting others in a precise manner.
The cell membrane is made up of phospholipids in which proteins are embedded into it. It allows the easy passage of small uncharged molecules like water.
Therefore, it is well described above.
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