1.20 BiSci001 - BiSci001 Wednesday, January 20 th, 1999...

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BiSci001 Wednesday, January 20 th, 1999 Announcements: Lecture notes: Lipids Lipids are almost completely composed of Carbon and Hydrogen and are therefore non-polar (hydrophobic). Functions: storage and transport of energy (triglycerides) membranes (phospholipids and cholesterol) protective coats (waxes) steroid hormones (testosterone and estrogen) pigments Common Lipids Triglycerides are three fatty acids linked to glycerol. Glycerol is a 3C alcohol. A fatty acid is a long chain unbranched hydrocarbon with a COOH (carboxylic acid) on the end. See figures 2.20 and 2.21 in the book. We store fat as triglycerides The fat we eat is in the form of triglycerides The reaction linking glycerol to a fatty acid is a condensation. 1 fatty acid linked to glycerol is a monoglyceride 2 fatty acid linked to glycerol is a diglyceride 2 fatty acid linked to glycerol is a triglyceride A saturated fatty acid has all single bonds between the carbon atoms. These molecules can pack very tightly. A monounsaturated fatty acid has one double bond somewhere in the chain of carbons. A polyunsaturated fatty acid has more than 1 double bond in its structure. A double bond makes a kink in the molecule and the molecules cannot pack as closely as saturated fatty acids. This is why fats with a high proportion of saturated fatty acids are solid at room temperature and why oils with high
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proportions of mono- or polyunsaturated fats are liquid at room temperature. Phospholipids
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This note was uploaded on 02/21/2008 for the course BI SC 001 taught by Professor Schlegel during the Spring '99 term at Pennsylvania State University, University Park.

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1.20 BiSci001 - BiSci001 Wednesday, January 20 th, 1999...

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