2d B130_02d_Biomolecules_-_Lipids_outline

2d B130_02d_Biomolecules_-_Lipids_outline - Polar Head...

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Unit 2d Lipids major types of lipids in cells fats/oils (triglycerides) glycerol plus fatty acids, ester linkages saturated/ unsaturated, cis/ trans sterols cholesterol, steroids phospholipids functions of lipids energy storage signal molecules biological membranes – phospholipid bilayers 1
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Lipids group of carbon-containing compounds that are largely non-polar / hydrophobic significant proportion of a given lipid molecule is hydrocarbon the only macromolecule that is not a polymer major groups of lipids in cells: fats / oils energy storage sterols cholesterol – membrane component 2
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Fats (Triacylglycerols, Triglycerides) 3 glycerol (3-carbon alcohol) fatty acid (carboxylic acid with long hydrocarbon ‘tail’)
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ester linkages
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Fatty Acids: Saturated versus Unsaturated 5
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cis versus trans 6 test yourself: Is linoleic acid (previous slide) cis or tran s?
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Sterols 7 Fig 6.4a
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Phospholipids – basic plan 8 diacyl glycerol phospholipid +/-
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Unformatted text preview: Polar Head Group Phospholipid: Phosphatidyl Choline 9 Functions of Lipids • storage of chemical energy • signal molecules • vitamins • wax coatings on leaves and skin • biological membranes 10 Phosphatidyl Choline, again 11 phospholipids are amphipathic their most important feature with respect to biology Phospholipid Bilayers 12 Fig 6.5 micelles bilayers Micelles and bilayers form spontaneously. • micelles / bilayers form spontaneously yet they are more organized than free phospholipids • appears to break 2nd Law of Thermodynamics • micelles / bilayers have lower potential energy than independent phospholipids • free phospholipids unstable in water because tails disrupt H-bonds so … • amphipathic molecules are much more stable energetically in aqueous solution when their hydrocarbon tails avoid water and interact with each other 13...
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This note was uploaded on 03/01/2012 for the course BIOL 130 taught by Professor Bols during the Spring '08 term at Waterloo.

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2d B130_02d_Biomolecules_-_Lipids_outline - Polar Head...

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