the cell membrane
Selectively permeable refers to a cell membrane that will let certain things in and out of the cell, but block other things.
diffusion
Will only allow something of a certain size or with certain characteristics to pass through.
the cell membrane
Plasma (Cell) Membrane
"Selectively permeable" refers to a membrane that allows certain substances to pass through while blocking others. This selectivity is based on the size, charge, or other properties of the molecules trying to cross the membrane. An example is a cell membrane, which permits the passage of specific molecules necessary for the cell's function while blocking others.
It means that is/can be a door to a cell 'hence semi permeable membrane? (or to anything)
Cell membranes are indeed selectively permeable.
Cell membranes are selectively permeable while cell walls are semi-selectively permeable. Keep in mind that only low level organisms, like plants, have cell walls.
It is important because, if the cell membrane was not selectivly permable, we would not be able to do the things today.
it occurs in the cell membrane(through the cell membrane really)
The cell membrane is selectively permeable, allowing only certain molecules to pass through based on size, charge, and other factors. Conversely, the nuclear envelope is fully permeable to molecules of certain sizes.