Cell-surface membrane
- Created by: Alice
- Created on: 12-01-14 16:30
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- Cell Surface Membrane
- All membranes are known as plasma membranes
- Cell boundary; allow different conditions in/out of cell. Control entry and exit
- Made up of carbohydrate, lipid, and protein
- Effective as phospholipids are polar and can form a bi-layer sheet
- Phospholipids form a bilayer sheet
- Allow lipid-soluble substances to enter/leave cell
- Make membranes flexible
- Prevent water-soluble substances entering/leaving cell
- 1 layer: hydrophilic heads interacting with water in cell cytoplasm
- 1 layer: hydrophilic heads pointing out, interacting w/ water around cells
- Hydrophobic tails protected from water by pointing inwards
- Proteins are embedded in the bilayer
- Extrinsic proteins
- On surface, never extend across bilayer
- Give support or act as cell receptors
- Act as receptors
- Intrinsic proteins
- Span across the bilayer
- Act as carriers, others are enzymes
- Act as carriers for water-soluble substances
- Structural support
- Give support or act as cell receptors
- Act as receptors
- Give support or act as cell receptors
- Act as carriers for water-soluble substances
- Form ion channels for active transport
- Form recognition sites
- Extrinsic proteins
- Fluid-mosaic model of the CSM
- Fluid: flexible structure, always changing shape - molecules can move relatively
- Mosaic: embedded proteins vary in shape, size, and pattern
- All membranes are known as plasma membranes
- All membranes are known as plasma membranes
- Cell boundary; allow different conditions in/out of cell. Control entry and exit
- Made up of carbohydrate, lipid, and protein
- Effective as phospholipids are polar and can form a bi-layer sheet
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