Biology Cell membranes
- Created by: Chloesn
- Created on: 10-04-14 21:36
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- Chapter 2 Plasma Membranes
- Fluid mosaic model
- Glycolipids
- Glycoproteins
- Proteins
- Channels
- Cholesterol
- Phospholipid bilayer
- Phospolipid molecule
- Head - Phosphate
- Hydrophilic
- Tail - lipid
- Head - Phosphate
- Phospolipid molecule
- Constant motion
- Appearance from above
- Cell signalling
- Receptor
- Acts an ion channel
- Activates a G-protein
- (Glycoprotein)
- Acts as an enzyme
- Receptor
- Movement
- Osmosis
- Water potential gradient
- High to low
- How much and pressure applied
- Animal cell
- High water potential = lysis
- Low water potential = crenated
- Plant cell
- High water potential = turgid
- Low water potential = Membrane pulls away
- Plasmolysis
- Balanced water potential = flaccid
- Diffusion
- Concentration gradient
- Net movement of molecules and ions
- Facilitated diffusion
- Active transport
- Requires ATP
- Sodium-potassium pump
- 2K+ in
- 3Na+ out
- Against concentration gradient
- Osmosis
- Exocytosis
- Out of the cell
- Endocytosis
- Into the cell
- Vesicle
- Out of the cell
- Vesicle
- Into the cell
- Temperature and permeablity
- Heat = more permeable
- Vibrate more = temporary gaps
- Low temperature = decreased permeablity
- Vibrate less = pack tightly
- Heat = more permeable
- Fluid mosaic model
- Hydrophobic
- Tail - lipid
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