| Front | Describe the structure of a plasma membrane and explain how different substances are able to pass through the membrane by diffusion. (6 marks) |
|---|---|
| Back | Phospholipids forming bilayer/two layers; Details of arrangement with “heads” on the outside; Two types of protein specified: channel/carrier proteins Reference to other molecule e.g. cholesterol or glycoprotein; Substances move down concentration gradient/from high to low concentration; Water/ions through channel proteins/pores; Small/lipid soluble molecules/examples pass between phospholipids/ through phospholipid layer Carrier proteins involved with facilitated diffusion; |
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