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11 Cards in this Set
- Front
- Back
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Cell Surface Membrane (Outside Cell) |
-Separates cell's content from its environment. -Regulates transport in/out of cell -May contain enzymes -Contains 'self' antigens for cell recognition -Contains receptors for cell signalling -Site of some metabolic reaction |
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Cell Surface Membrane (Inside Cell) |
-Separates organnelle contents from cell cytoplasm -Enable compartmentalisation & concentration of molecules involved in metabolic processes. -Site of metabolic processes e.g. respiration, photosynthesis, digestion -Regulating transport in/out of organelles. |
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Membrane Structure |
-Composed of phospholipid molecules -Amphipathic: passes regions that are hydrophobic and hydrophilic -Proteins: Channel and Carrier -Cholesterol -Glycoproteins -Glycolipid |
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Phospholipid |
Amphipathic. Hydrophobic fatty acid tail and hydrophilic fatty acid head. Forms phospholipid bilayer - 7nm in width |
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Glycoprotein/Glycolipid |
A carbohydrate chain attached to a protein molecule A carbohydrate chain attached to a lipid molecule. |
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Cholesterol |
Is a steroid alcohol Gives mechanical stability and flexibility. |
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Channel Protein |
Span the whole lipid bilayer and are integral. Allow ions which have an electrical charge and are surrounded by water molecules to pass through. |
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Carrier Protein |
Span the whole lipid bilayer and are integral. Can change their shape, to carry specific molecules across the membrane. |
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Receptor Sites |
Bind to molecules e.g. hormones. Function as enzymes, antigens or receptor sites for complementary - shaped signalling chemicals such as hormones. |
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Enzymes & Coenzymes |
In the membrane. Metabolic reactions (photosynthesis and respiration) |
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Glycocalyx |
Carbohydrate molecules that are hydrophilic and are on the outside of the membrane. Attract water with dissolve solutes, helping the cell interact and obtain dissolved substances |
