Biological Membranes
- Created by: selen.
- Created on: 19-04-15 17:16
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- Biological Membranes
- Phospholipids
- Hyrdophillic head and two hydrophobic fatty acid tails
- Water can diffuse b/c of the hydrophillic head
- In a cell the phospholipds are surrounded by water, forming a bilayer
- Hyrdophillic head and two hydrophobic fatty acid tails
- Glycoproteins and Glycolipids
- Carbohydrate parts can be found on some phospholipids and proteins in th emebrane
- when phospholipds have carb molecules, they are called glycolipids
- Phospholipids
- Hyrdophillic head and two hydrophobic fatty acid tails
- Water can diffuse b/c of the hydrophillic head
- In a cell the phospholipds are surrounded by water, forming a bilayer
- Hyrdophillic head and two hydrophobic fatty acid tails
- Phospholipids
- when protein molecules have carb attached to them they are called glycoproteins
- when phospholipds have carb molecules, they are called glycolipids
- May be involved in cell-signalling to allow recognition by immune system
- Carbohydrate parts can be found on some phospholipids and proteins in th emebrane
- Cholesterol
- gives membranes of some eukaryotic cells mechanical stability
- Sits between fatty acid tails to make barrier more complete, so water and ions could not easily pass through
- gives membranes of some eukaryotic cells mechanical stability
- Proteins
- Carrier Proteins
- active movement of charged substances (ions)
- e.g. in plants Mg2+ is actively pumped (w/ ATP) for the manufacture of chlorophyll
- active movement of charged substances (ions)
- Channel Proteins
- movement of large, hydrophillic molecules across the membrane
- Carrier Proteins
- Metabolic Processes
- Enzymes and co enzymes
- Some parts of photosynthesis is carried out in chloroplasts. Some parts of respiration is carried out in mitochondria
- co/enzymes may be bound to these membranes. The more membranes the more co/enzymes
- Why mitochondira fold to form cristae (SA)
- Why chloroplasts have stacked membranes called thylakoids (SA)
- co/enzymes may be bound to these membranes. The more membranes the more co/enzymes
- Some parts of photosynthesis is carried out in chloroplasts. Some parts of respiration is carried out in mitochondria
- Enzymes and co enzymes
- Membranes and temperature
- Increasing temp gives molecules more kinetic energy
- Therefore the bonds break
- Makes membrnae more pourous as the molecules move faster
- Therefore the bonds break
- Increasing temp gives molecules more kinetic energy
- Receptor sites
- Phospholipids
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