Describe5 marksChallenge
The table below lists components of a cell surface membrane and a proposed role. Each proposed role is incorrect or incomplete.
| Component | Proposed role |
|---|---|
| Phospholipid | Forms a rigid barrier |
| Cholesterol | Prevents any movement of phospholipids |
| Glycoprotein | Energy storage |
| Glycolipid | Structural support |
| Channel protein | Active transport of ions |
For each component, write a correct description of:
- its arrangement within the fluid mosaic model
- its actual role(s) in the cell surface membrane, with reference to membrane properties (fluidity, permeability, stability, transport) and, where relevant, the stages of cell signalling (secretion of ligands, transport to target cells, binding of ligands to cell surface receptors).