Flashcards
Cell membrane & Transport
Flashcards do conjunto (11)
- 1what is the usual distance across the plasma membrane?1-9 nanometres
- 2what is the main role of the plasma membrane?to control the entry an exit of materials
- 3why is a phospholipid bilayer called a bilayer?the phospholipids arrange themselves in a double layer with the phosphate heads facing out and the fatty acid tails facing inward
- 4the plasma membrane consists mainly of what?phosphoplipds and proteins
- 5what is the role of the phospholipids?forms a bilayer preventing entry of water soluble substances such as glucose. allow entry of lipid soluble substances such as oxygen and glycerol
- 6role of extrinsic proteinsonly found on outer surface of membrane - provides support
- 7role of intrinsic proteinsact as channels and carriers for polar molucles to enter and exit the cell
- 8role of glycolipidscarb and a lipid - involved in cell recognition
- 9role of glycoproteinscarb and a protein form recognition sites
- 10role of cholesteroltype of lipid beween phosphopilid bilyer - more cholesterol controls rigidity of membrane
- 11why is it called fluid mosaic model?described as fluid as the components are free to move around and it is described as mosaic as proteins are scattered in the lipid layer.
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- Biology FlashCards sobre Cell membrane & Transport, criado por paigexmonks em 19-05-2013.
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