Lipids
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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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Lipids

Lipids


Lipids1

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


Lipids

  • 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


Lipids

  • 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


Steroids

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


Lipids

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  • Read pages 35 - 39

  • #11 - 13, 15-18


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