2.2 lipid note

2.2 lipid note - -1- LIPIDS made of C, H and O soluble in...

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- 1 - LIPIDS - made of C, H and O - soluble in oil, insoluble in water - fewer O 2 ; less polar - mostly made of hydrocarbon chains which are joined by non-polar covalent bonds (thus non-polar molecules) - composite molecules (not polymers) Examples : 1. Triglycerides or Triacylglycerols (fats and oils) 2. Phospholipids 3. Glycolipids 4. Waxes 5. Terpenes 6. Steroids Functions: 1. source of energy 2. insulation 3. cushions or protects organs 4. structural component (phospholipids in the cell membrane) 5. protection, polish, lubricate, waterproof, fuel (waxes) 6. colour, absorb the Sun’s energy (terpenes) 7. regulate reactions (steroids) 8. helps in absorption of fat soluble vitamins Foods that Contain Lipids : - oils, butter, red meats, cheese, peanuts, etc. Examples: 1. Triglycerides or Triacylglycerols - made up of (a) glycerol (3 carbon alcohol) OH OH OH hydroxyl groups (alcohol) H C C C H H H H (b) fatty acids O carboxyl group (acid) HO C R hydrocarbon chain (alkyl group)
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- 2 - Formation of a Triglyceride
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2.2 lipid note - -1- LIPIDS made of C, H and O soluble in...

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