The cell wall's purpose it to keep a plant upright (Generally) and a membrane controls what enters and exits the cell.
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(WillyD)
Permeability
It is the ability of the membrane to allow ions and/or particles to cross.
permeability
Selective permeability refers to the fact that the plasma membrane can choose which molecules to let in or out of the cell.
Selective Permeability
The selective permeability of the cell membrane
Cell membrane
Permeability
A membrane is selectively permeable.
It is the ability of the membrane to allow ions and/or particles to cross.
permeability
Through something called "Selective permeability"
Selective permeability refers to the fact that the plasma membrane can choose which molecules to let in or out of the cell.
Selective Permeability
The selective permeability, also called semi-permeability, of the membrane controls which substances cant enter and exit the cell.
The permeability of the cell membrane controls which substances may pass in or out of the cell.
means that the cell membrane has some control over what can cross it, so that only certain molecules either enter or leave the cell