lecture 9-14-09 lipids & membrane structure

lecture 9-14-09 lipids & membrane structure -...

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Chapter 5 (pp.74-77) For LIPIDS… Learning objectives: Describe the: - elemental composition , - molecular structure/subunits , and - functions Describe the building-block molecules, structure, and biological importance of fats , phospholipids , waxes and steroids Identify an ester linkage and describe how it is formed Distinguish between saturated and unsaturated fats Compare the energy content of carbohydrates and lipids Chapter 7 (pp.125-128) Membrane structure Describe the “fluid mosaic model” of a membrane Explain how the fluidity of a membrane is influenced by the presence of cholesterol and unsaturated fatty acid chains of phospholipids Be able to draw a cross-sectional view of a plasma (aka ‘cell’) membrane showing the basic structure and essential components Terms to know include…omega fatty acid, hydrogenation, trans/cis fatty acid, triglyceride, hydrophilic, hydrophobic, saturated/unsaturated,. .
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Lipids… elemental composition composed of C, H, O, & one type also has P DO NOT consist of polymers are diverse, but share the common trait of being hydrophobic Includes…fatty acids, fat (triglycerides), phospholipids, waxes, sterols
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Fatty acids are long chain hydrocarbons + a carboxyl group at one end FATTY ACIDS LIPIDS - molecular structure/subunits
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SATURATED F atty acids : Those with the maximum number of hydrogen atoms covalently bonded to its carbon atoms, no more can be added . Saturated fatty acids are solids at room temperature, they “pack” closely together (examples – animal fat, lard, real butter…) UNSATURATED Fatty acids have less hydrogen atoms because of one or more double bonds between carbon atoms, Because of the kinks in the hydrocarbon tails, unsaturated fats can’t pack as closely together, thus, they “flow” as oils at room temperature (e.g. plant oils like canola oil, corn oil, olive oil…).
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In HYDROGENATION , hydrogen is ADDED to reverse unsaturation by… • changing some double bonds into single bonds, but also… some double bonds simply change from cis to trans configuration . these effects straighten out the molecules . . so they pack closer together and become more solid
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Why is “ trans fat ” (trans fatty acid) bad for you? Eating
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This note was uploaded on 01/20/2010 for the course BIO 50415 taught by Professor Batterton during the Fall '09 term at University of Texas at Austin.

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lecture 9-14-09 lipids & membrane structure -...

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