CGP - Cell Membrane Structure Flashcards
1
Q
Why is the bilateral called ‘fluid’?
A
Because the phospholipids are constantly moving.
2
Q
Why are cell membranes called ‘mosaic’?
A
Because proteins are scattered through the bilayer like tiles in a mosaic.
3
Q
Outline phospholipids.
A
Phospholipid molecules have
- a hydrophilic head : attracts water
- a hydrophobic tail : repels water
Heads face outwards in the bilayer
Tails face to the centre of the bilayer so the membrane doesn’t allow water soluble substances eg ions through.
4
Q
What does cholesterol do in the cell membrane?
A
It gives the membrane stability
5
Q
Where are cholesterol molecules found?
A
They fit between the phospholipids. They bind to the hydrophobic tails of the phospholipids, causing them to pack more closely together.
