It allows the passage for certain substances.
The property of a membrane or other material that allows some substances to pass through it more easily than others. .
Usually proteins are the molecules doing the selection of what other molecules get into or out of a cell.
The cell membrane controls selective permeability. Larger substances can enter the cell through endocytosis and exit through exocytosis.
Differential permeability can be described as phenomenon where a differential permeable membrane through different diffusion processes allows smaller molecules/ions as glucose, sodium and chlorine to...