Biological Membranes
- Created by: Natashaw101
- Created on: 29-11-18 14:49
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- Biological Membranes
- Structure
- Glycoproteins
- Receptor sites, antigens, cell adhesion
- Glycolipids
- Receptor sites, antigens, cell adhesion
- Glycolipids
- Integral/peripheral proteins
- Carrier/channel proteins
- Cholesterol
- regulates fluidity
- Phospholipid bilayer
- barrier
- Glycoproteins
- Factors affecting membrane permeability
- temp
- high: proteins denature + bilayer more fluid
- low: sat.fats compress, unsat. kinks
- solvents
- change protein bonding
- bind to phospholipid heads
- dissolves cholesterol
- temp
- Transport across membrane
- Passive
- Osmosis
- water
- across bilayer
- Simple diffusion
- small uncharged gases and lipid-soluble molecules
- across bilayer
- Facilitated diffusion
- large polar molecules and ions
- channel protein
- Osmosis
- Active
- Active transport
- eg.k+Na+ pump
- carrier protein
- Exocytosis
- eg.insulin
- Endocystosis
- eg.pathogens
- Active transport
- Passive
- Structure
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