A membrane which allows some small molecules to pass through it by diffusion but does not allow other molecules through.
The amount of a substance (solute) in a solution
Charge particles formed when an atom loses or gains electrons during the formation of ionic bonds
Drag the labels to identify the different parts of the cell.
2. Into and out of cells
Drag the answers into the correct boxes, to summarise how molecules get into and out of cells.
|Molecules moved from low concentration into high concentration using energy.|
|Absorption of water in the digestive system.|