Biology Ch.5 Cell Membrane
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Cell Membrane Structure and Components
- 1. Phospholipid Bilayer: 2 layers of phosphate and fat
- - Phosphate is hydrophillic
- - lipid is hydrophobic
- 2. Protein- embedded in layer
Cell Membrane Protein Components
- Glycoprotein- used for cell-to-cell communication, carb identification
- Receptors- to send/recieve messages
- Enzymes- catalyze reaction
- Transporter- transport substances
What do Transport Proteins depend on?
Concentration Gradient (must have in order to be transported)
Small Molecule Transportation (explanation)
- Uses "Passive Transport": moves substances from high concentration to low concentration (moving down gradient)
- Strives to reach equlibrium
- NO ENERGY REQUIREMENT
Types of "Passive Transport"
- Diffusion- movement of hydrophobic substances
- Osmosis- diffusion of WATER across semipermiable membrane
3 Types of Osmosis "Tonicity"
- Isotonic- solute concentration is equal between cell and solution (outside of cell)
- Hypotonic- solute concentration of solution (outside of cell) is LOWER than cell
- Hypertonic- solute concentration of solution (outside of cell) is higher than cell
Osmosis "Tonicity" (def)
Ability of solution to make cell Gain or Lose water.
- Uses transport protein and moves hydrophillic substances
- Aquaporins- proteins that move water
Active Transport (explanation)
- Movement is Low to High "against gradient"
- REQUIRES ENERGY
- REQUIRES TRANSPORT PROTEINS
Large Molecule Transportation
- Exocytosis- Exporting out cell (EXIT)
- Endocytosis- Importing into cell (ENTER)
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