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→Key Stage 4
: In a [[Plant Cell|plant cell]] the '''cell membrane''' is protected by a [[Cell Wall|cell wall]] on top of it.
: The '''cell membrane''' only allows in certain [[molecule]]s. This is referred to as a [[Partially Permeable Membrane|partially permiable membrane]]. This means some [[molecule]]s, like [[water]], can diffuse in and out of the [[Cell (Biology)|cell]], however, some cannot pass into the [[Cell (Biology)|cell]].
==Key Stage 5==
{{#ev:youtube|https://www.youtube.com/watch?v=nsklF1w4eok}}