Fluid Mosaic Model
- Created by: Steff06
- Created on: 04-04-16 11:25
View mindmap
- Glycoproteins and glycolipids:
- Some phospholipid molecules and some of the proteins in the membrane have a small carbohydrate part attached to them.
- Where PHOSPHOLIPID molecules have a carbohydrate part attached, they are called GLYCOLIPIDS.
- Where PROTEINS have a carbohydrate part attached, they are called GLYCOPROTEINS.
- The Fluid Mosaic Model
- Membrane stability + fluidity:
- CHOLESTEROL gives membranes of EUKARYOTIC cells STABILITY.
- Cholesterol fits between fatty acid tails and makes the barrier more complete so substances e.g. water and ions cannot pass easily/directly through the membrane.
- CHOLESTEROL gives membranes of EUKARYOTIC cells STABILITY.
- Membrane transport:
- CHANNEL proteins allow movement across the membrane. Some molecules are too large/hydrophilic to pass through the bilayer. So they enter+leave cells using these protein channels.
- CARRIER proteins actively move substances across the membrane. E.g. Mg+ ions are actively pumped using ATP energy into root hair cells from soil.
- Recognition and communication:
- RECEPTOR SITES - Hormones bind to the cell so a response can be carried out. Can only bind with a receptor.
- GLYCOLIPIDS and GLYCOPROTEINS involved in cell signalling. Act as hormone receptor.
- Metabolic processes:
- ENZYMES and COENZYMES. Reactions in photosynthesis + respiration happen in membranes. Enzymes and coenzymes may be bound to these membranes.
- Membranes and temperature:
- INCREASING temperature increases KINETIC ENERGY, so they move faster and makes membranes LEAKY.
- Leaky means substances that would not normally do so can enter/leave the cell.
- INCREASING temperature increases KINETIC ENERGY, so they move faster and makes membranes LEAKY.
- Membrane stability + fluidity:
Comments
No comments have yet been made