The phrase that best describes the property of selective permeability is “some molecule pass.” Let me shed more light on this in case you still dean doe acts. Selective permeability can is described as cellular membrane property that allows only certain molecules to exit or enter the cell.
This is an essential thing to be done so as to maintain the internal order of the cell irrespective of the alterations to the environment. Water, carbon dioxide, glucose, and ions, for example, may need to be exported or imported from the cell, but depending on its metabolic activity.
Also, there may be a need for signaling molecules to enter the cell, as well as the need for the release of protein into the extracellular matrix. The selectively permeable membrane, being present, permits the cell to exercise control over the timing, quantum, and rate of these molecules’ movements. The movement through a permeable membrane can either be active or passive.