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Lipids

Lipids. Lipids. Also consist of C, H, and O There are fewer OH bonds and more CH bonds Insoluble in water but soluble in other non-polar substances 4 Groups of Lipids Fats Phospholipids Steroids Waxes. Fats are the most common energy storing molecule 9 cal/g

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Lipids

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  1. Lipids

  2. Lipids • Also consist of C, H, and O • There are fewer OH bonds and more CH bonds • Insoluble in water but soluble in other non-polar substances • 4 Groups of Lipids • Fats • Phospholipids • Steroids • Waxes

  3. Fats are the most common energy storing molecule • 9 cal/g • Carbohydrates and Proteins have 4 cal/g • The most common fat in human life is the triglyceride • 3 fatty acids and one glycerol molecule • Fatty acid chains are usually 16 - 18 C’s long • Fatty acids are bonded to glycerol through condensation reaction through an ester linkage • The process is called esterification • Fig 19 pg 37

  4. Phospholipids • Cell membranes • Phosphate head is polar • Tails are non-polar • When added to water they form micelles - spheres where the polar head dissolves in the water and the tails are attracted to each other to form the ring • Pg 38 Fig. 20

  5. Steroids • Located in cell membranes • Four fused hydrocarbon rings and several different functional groups • Cholesterol - embedded in membranes • Can be converted into many substances • Vitamin D • Bile salts • Sex hormones are also steroids • Fig 23 pg 39

  6. hwk • Read pages 35 - 39 • #11 - 13, 15-18

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