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Describe the 3 functions of the membrane at the surface of the cell.
>Separating cell contents from the outside environment
>Controls which substances enter and leave the cell
>Cell recognition and signalling
Describe the 3 functions of the membrane within the cell
>Divide cell into compartments making different functions more efficient
>Can form vesicles
>Control which substances enter and leave the organelle.
Describe the 'fluid mosaic' structure.
>Phospholipid molecules form a continuous fluid bilayer
>Various protein molecules are scattered through the bilayer some can move around
>Glycoproteins (protein molecules have a carbohydrate part attached)
>Glycolipids (phospholipid molecules have a carbohydrate part attached)
>Cholesterol
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