Structure Of Membranes Flashcards
All living cells are surrounded…
By the cell surface membrane
Cell membrane function
- controls the exchange of materials
- regulars the transport across the membrane
- receive messages
Phospholipids can form…
Little bags in which chemicals are isolated form the external environment =cells and organelles
When the phospholipids are in water they…
- spread as single layer of molecules on the surface of water
- forms micelles surrounded by water
- form bilayer
- form bilayers from membrane-bound compartments (liposome)
Micelle has…
The fatty acid tails facing towards each other creating small ball.
Liposome is made…
Of bilayer membrane compartments, creating space in the middle of the ball.
Fluid mosaic model of membrane
Membrane made of phospholipids and proteins that can move about by diffusion
Phospholipids move sideways…
In their own layers.
Proteins in the membrane.
Move
What does it mean mosaic model?
The pattern made by the scattered protein molecules when viewed from above
The diameter of membrane is…
7nm
In phospholipids bilayer the molecules…
Move.
In phospholipid bilayer tails are facing…
Inwards- form non-polar hydrophobic interior, the more unsaturated they are, the more fluid the membrane is.
The lower the temperature…
The less fluid the membrane is.(Some organisms respond by increasing the number of unsaturated fatty acids)
The longer the tails…
the less fluid the membrane is.
