Bio lec 102 4
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- carbon containing compounds
- Mostly nonpolar and hydrophobic
3 types of lipids in cells
contains both hydrophobic and hydrophilic domains. It's what phospholipids are
Which phospholipid tail is more easily permeated?
Unsaturated (results in bent tails) and short tails
Does temperature effect permability?
yes. Higher temperatures result in higher permeability.
small ion or molecule in solution
Random movement of solutes... There is a random movement of solution resulting in equilibrium or evenness through out.
Movement of water that occurs when uneven solutions are seperated by permeable membrane.
high concentration outside of cell
high concentration inside the cell
ideal... equal concentration and no water loss/gain
form basic structure of membrane and isolate it from environment
Proteins (in cell membrane)
they do the work and form the channels to import things in and out of the cell
Fluid mosaic model
proteins embedded within lipid bilayer
results in bent tails making them more permeable. (think oil).. Shit's easy to get through.
(think butter) Results in longer straighter tails that are not as easily permeated.
Difference in solute concentration.
When solution is mixed enough to be the same throughout. (movement still occurs even after equilibrium is achieved)
- Membrane proteins that are inserted into the lipid bilayer and are hydrophobic
These are attached to one side of bilayer.
2 types of channel transport
- •Movement of molecules WITH gradient
- through channel
- •No energy required (1 type of
- passive transport)
- Needs protein carrier
- •Transport of molecules or ions
- AGAINST gradient
•Requires energy (ATP)
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