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Lipids - Coggle Diagram
Lipids
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Triglycerides
Glycerol and three fatty acids. Tails made of hydrocarbons and are hydrophobic. This makes them insoluble in water.
Structure
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Long hydrocarbon tails contain lots of chemical energy, which is released when they are broken down.
They are insoluble (they don't affect the water potential). They clump together as insoluble droplets with the fatty acid tails in the middle to shield themselves from the water.
Condensation reaction
Fatty acid joins to a glycerol. This forms and ester bond and a molecule of water is released. This happens three times to form a triglyceride, one for each fatty acid tail.
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Phospholipids
Structure
They make up the bilayer of cell membranes. Cell membranes control what substances enter and exit the cell.
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This creates a hydrophobic centre meaning water soluble substances cannot easily pass through the membrane.
Found in cell membranes. Similar structure to triglycerides but one fatty acid tail is replaced with a phosphate group. The tails are hydrophobic while the phosphate group is hydrophyilic.
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