Lipids
- Created by: katieshrmn
- Created on: 16-03-15 13:11
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- Lipids
- A lipid is a broad range of different molecules. All sharing the property that they're insoluble in water
- Triglycerides
- Fat or Oil
- Fat = Solid at room temp
- Mainly saturated fatty acids
- Oil = Liquid at room temp
- Mainly unsaturated fatty acids
- Fat = Solid at room temp
- 1 glycerol molecule + 3 molecules of fatty acids
- Each fatty acid is joined to the glycerol by condensation reaction which creates an ESTER BOND
- 3 Molecules of water is released!
- Fatty acids can be identical or different
- 70 types
- Vary in length
- 14-16 Carbons
- usually even number
- Saturated (single bonds between carbons) or Unsaturated (double bonds between carbons)
- Position of double bond varies
- Unsaturated will kink so molecules cant lie close to each other ...weak bonds.. lower melting point
- Each fatty acid is joined to the glycerol by condensation reaction which creates an ESTER BOND
- Broken down by adding 3 molecules of water - Hydrolysis
- Store energy (more than glucose)
- Lots of H needed for making ATP
- Insoluble ... don't effect the water potential
- Insulation
- Buoyance
- Protects organs
- Waterproofing
- Fat or Oil
- Phospholipids
- 1 glycerol molecule, 2 fatty acids, 1 phosphate group
- Phosphate group can dissolve in water (charged)
- Fatty acids = non-polar so they're hydrophobic taiils
- Cell Membranes
- Hydrophobic tail provide a barrier to water soluble moleules
- The head can dissolve in the cytoplasm or tissue fluid
- 1 glycerol molecule, 2 fatty acids, 1 phosphate group
- Cholesterol
- Component of cell membranes in animals
- OH group sticks between the polar hydrophillic heads of the phospholipids
- The rest of the molecule is non-polar so it will sit between the tails
- Also makes bile to digest fat
- Also makes hormones
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