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Lipids
Lipids are composed of:
• Carbon
• Hydrogen
• Oxygen
BUT: Lipid molecules have a larger number of Carbon and Hydrogen and a smaller number of Oxygen than Carbohydrates
“CHO”
Lipid Functions
• Lipid molecules provide a barrier b/t a cell and its watery environment
Lipid Functions
• Insulation of whales and walruses
Lipid Functions
• Skin oils help repel water from feathers of ducks
Lipid Functions
• Waxy layer of plants, keeps water in
Fatty Acids• Lipids are composed of building blocks or
MONOMERS called Fatty Acids.Yellow
Pink/Red
Fatty Acids
• Carboxyl end (-COOH)– polar– Hydrophilic: “water loving”
– Hydrocarbon end (CH3)
• Non-polar• Hydrophobic: “Water fearing”
WATER
Arrangement of FA in Cell
Functions of Lipids
• Store Energy!!
• Fats have more H bonds than Carbs and can store more energy.
Kinds of LIPIDS
1. Triglycerides
2. Waxes
3. Steroids
4. phospholipids
Triglycerides
Composed of:
1. 1 glycerol molecule
2. 3 molecules of fatty acids
TWO categories of triglycerides
1. Saturated
2. unsaturated
Waxes
• Plant waxes– Forms protective
coating on outer surface
• Earwax– Prevents bacteria from
entering middle ear
Steroids
• Composed of 4 carbon rings
• Found :– Hormones– Toad venom– Plant poisons– Chlorophyll– Cholesterol
THE END