2.4 Membranes
Crash Course Biology: In Da Club – Membranes and Transport, by Hank
Essential Biology 2.4: Membranes
Fluid Mosaic Model Tutorial from Davidson.edu
For lots more animations on cell structure and function and cell transport, visit North Harris College.
You can also work through the Membranes lessons from HippoCampus Biology.
……….o0O0o……….
Membrane Structure: The Fluid Mosaic Model
- Fluid Mosaic Model Tutorial from Davidson.edu
- Membranes organise cellular complexity and form spontaneously, from Learn.Genetics
- Animated plasma membrane, by John Kyrk
- Membrane structures and formation, from Carnegie Mellon
……….o0O0o……….
Hydrophilic and hydrophobic properties maintain the phospholipid bilayer
- Animated plasma membrane, by John Kyrk
- Phospholipid bilayer, from YellowTang
- Membrane structures and formation, from Carnegie Mellon
……….o0O0o……….
Functions of Membrane Proteins
Hormone binding sites, immobilized enzymes, cell adhesion, cell-to-cell communication, channels for passive transport, and pumps for active transport.
- Example of cell-cell communication from Learn.Genetics
……….o0O0o……….
The plasma membrane is selectively permeable
- Membrane permeability simulation, from Carnegie Mellon
……….o0O0o……….
Diffusion and Osmosis
- How diffusion works, from McGraw Hill
- Diffusion applet from Ohio Biosci
- Diffusion animation, by John Kyrk
- How osmosis works, from McGraw Hill
- Clear osmosis animation, from StOlaf.edu
- Membrane transport, from Wiley Interactive Concepts in Biochemistry
- Isotonic Equilibrium: Osmosis Simulation, from Carnegie Mellon
Try these in the lab: Plasmolysis of Elodea and of onion cells.
……….o0O0o……….
Facilitated Diffusion
- PhET Lab simulation: Membrane Channels (allow Java to run)
- Membrane transport, from Wiley Interactive Concepts in Biochemistry
- How facilitated diffusion works, from McGraw Hill
- Facilitated diffusion, from Northland
- Passive transport: simple and facilitated diffusion from Freeman Lifewire
……….o0O0o……….
Active Transport & ATP
- Membrane transport, from Wiley Interactive Concepts in Biochemistry
- Sodium-potassium pump, from McGraw Hill
- Sodium-potassium pump, from StOlaf
- Active transport from Northland
- Active transport from Freeman Lifewire
……….o0O0o……….
Vesicle Transport: Endo- and Exocytosis
- Vesicle transport from Learn.Genetics
- Exocytosis, from StOlaf
- Animated plasma membrane, by John Kyrk
- Phagocytosis (endocytosis), from McGraw Hill
- Endoplasmic reticulum and Golgi apparatus, from Freeman Lifewire
- Lysosomes, from McGraw Hill
……….o0O0o……….
Membrane Fluidity
- Membrane fluidity from Learn.Genetics
- Animated plasma membrane, by John Kyrk
- Membrane fluidity, from Carnegie Mellon
- Membrane fluidity from John Gianni
Amoebae are single-celled eukaryotes, which can carry out all the functions of life. The fluidity of their plasma membrane allows them to feed through phagocytosis (endocytosis of solids):
What if boat sails were soap bubbles? From xkcd
……….o0O0o……….
Further Reading:
- ‘Bouncy’ cell membranes behave like cornstarch and water, from ScienceDaily
- Membrane fusion discovered in 2002, from Brookhaven National Laboratory
Leave a Comment
Comments (0)